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 When They Itch Pinch and Roll Die Cut Vinyl Decal $4.25 End Date: Monday May-28-2012 20:39:20 PDT Buy It Now for only: $4.25 Buy It Now | Add to watch list |
 I Love Rock n Roll Except When I Hate It Extremely $4.37 End Date: Tuesday Jun-19-2012 15:49:36 PDT Buy It Now for only: $4.37 Buy It Now | Add to watch list |
 I Love Rock n Roll Except When I Hate It Extremely $4.47 End Date: Thursday Jun-14-2012 7:10:55 PDT Buy It Now for only: $4.47 Buy It Now | Add to watch list |
 Goodby World Goodby with When the Roll Is Called Up Yonder Lister Kirkland SM $1.60 End Date: Friday Jun-1-2012 15:24:22 PDT Buy It Now for only: $1.60 Buy It Now | Add to watch list |
 When We Rock We Rock When We Roll We Roll Deep Purple $4.62 End Date: Friday Jun-22-2012 22:05:50 PDT Buy It Now for only: $4.62 Buy It Now | Add to watch list |
 Ill Be With You When the Clouds Roll By 1920 song $2.73 End Date: Tuesday May-29-2012 14:39:22 PDT Buy It Now for only: $2.73 Buy It Now | Add to watch list |
 Deep Purple When We Rock We Roll 1988 Used Comp $1.99 End Date: Tuesday Jun-5-2012 11:54:38 PDT Buy It Now for only: $1.99 Buy It Now | Add to watch list |
 DEEP PURPLE When We Rock We Rock and When We Roll We Roll Record LP $0.99 End Date: Sunday May-27-2012 19:53:22 PDT |
 When We Get to Surf City A Journey Through America in Pursuit of Rock and Roll $1.00 End Date: Monday May-28-2012 19:24:23 PDT Buy It Now for only: $1.00 Buy It Now | Add to watch list |
 DEEP PURPLE When We Rock We Rock When We Roll We Roll Greatest Hits CD $1.99 End Date: Thursday May-31-2012 9:28:16 PDT |
 When We Get to Surf City A Journey Through America in Pursuit of Rock and Roll $4.99 End Date: Friday Jun-1-2012 2:45:44 PDT Buy It Now for only: $4.99 Buy It Now | Add to watch list |
 When The Going Gets Tough Dealing with lifes ups and downs Yisroel Roll Good $4.99 End Date: Saturday Jun-2-2012 14:01:02 PDT Buy It Now for only: $4.99 Buy It Now | Add to watch list |
 I Love Rock n Roll Except When I Hate It Extremely Important Stuff About th $4.99 End Date: Thursday Jun-14-2012 1:53:37 PDT Buy It Now for only: $4.99 Buy It Now | Add to watch list |
 When the Nines Roll Over And Other Stories $1.00 End Date: Friday Jun-15-2012 4:01:37 PDT Buy It Now for only: $1.00 Buy It Now | Add to watch list |
 ALABAMA WHEN WE MAKE LOVE ROLL ON EIGHTEEN WHEELER 45 $1.00 End Date: Saturday May-26-2012 5:39:45 PDT Buy It Now for only: $1.00 Buy It Now | Add to watch list |
 Sheriff 45 When Im With You Give Me Rock n Roll $2.00 End Date: Tuesday May-29-2012 18:16:53 PDT Buy It Now for only: $2.00 Buy It Now | Add to watch list |
 I Love Rock n Roll Except When I Hate It Extremely $5.04 End Date: Friday May-25-2012 17:06:19 PDT Buy It Now for only: $5.04 Buy It Now | Add to watch list |
 I Love Rock n Roll Except When I Hate It Extremely $2.09 End Date: Monday Jun-11-2012 16:17:46 PDT Buy It Now for only: $2.09 Buy It Now | Add to watch list |
 Deep Purple When We Rock We Rock We Roll USA Cassette $2.25 End Date: Friday Jun-15-2012 14:05:05 PDT Buy It Now for only: $2.25 Buy It Now | Add to watch list |
 1920 Sheet Music ILL BE WITH YOU WHEN CLOUDS ROLL BY $1.99 End Date: Thursday May-31-2012 16:11:06 PDT Buy It Now for only: $1.99 Buy It Now | Add to watch list |
 When We Rock We Rock When We Roll We Roll by Deep Purple CD Oct 1988 $2.99 End Date: Monday May-28-2012 12:39:07 PDT |
 I Love Rock n Roll Except When I Hate It Extremely $5.51 End Date: Friday May-25-2012 17:06:19 PDT Buy It Now for only: $5.51 Buy It Now | Add to watch list |
 BON JOVI SLIPPERY WHEN WET CASSETTE TAPE ROCK N ROLL EX $2.69 End Date: Thursday May-31-2012 17:54:46 PDT Buy It Now for only: $2.69 Buy It Now | Add to watch list |
 2006 MATTEL TMNT SEA TURTLE ROLLERWE THINKUNSURELEGS MOVE WHEN YOU ROLL IT $2.00 End Date: Monday May-28-2012 15:50:58 PDT Buy It Now for only: $2.00 Buy It Now | Add to watch list |
 SPRINKLE WHEN YOU TINKLE FUNNY TOILET PAPER ROLL $5.95 End Date: Sunday Jun-17-2012 13:27:20 PDT Buy It Now for only: $5.95 Buy It Now | Add to watch list |
 When We Rock We Rock When We Roll We Roll Deep P $5.99 End Date: Tuesday Jun-12-2012 15:11:01 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 WHEN THE CLOUDS ROLL BY 2010 NEW DVD $6.30 End Date: Friday Jun-22-2012 17:33:09 PDT Buy It Now for only: $6.30 Buy It Now | Add to watch list |
 WHEN THE CLOUDS ROLL BY 2010 NEW DVD $3.30 End Date: Friday Jun-22-2012 17:34:05 PDT Buy It Now for only: $3.30 Buy It Now | Add to watch list |
 WHEN THE CLOUDS ROLL BY DVD NEW $6.40 End Date: Friday Jun-8-2012 2:12:21 PDT Buy It Now for only: $6.40 Buy It Now | Add to watch list |
 When The Clouds Roll By DVD $3.50 End Date: Wednesday Jun-20-2012 8:43:08 PDT Buy It Now for only: $3.50 Buy It Now | Add to watch list |
 When We Rock We Rock When We Roll We Roll by Dee $6.50 End Date: Monday Jun-4-2012 18:22:37 PDT Buy It Now for only: $6.50 Buy It Now | Add to watch list |
 When the Nines Roll Over And Other Stories $6.60 End Date: Sunday May-27-2012 3:52:45 PDT Buy It Now for only: $6.60 Buy It Now | Add to watch list |
 Piano Roll QRS 41894 When I Leave The World Behind $2.99 End Date: Friday Jun-1-2012 6:48:48 PDT Buy It Now for only: $2.99 Buy It Now | Add to watch list |
 Piano Roll Republic 51926 When I Look in Your Wonderful $2.99 End Date: Tuesday Jun-5-2012 9:10:38 PDT Buy It Now for only: $2.99 Buy It Now | Add to watch list |
 When We Get to Surf City A Journey Through America in Pursuit of Rock and Roll $2.76 End Date: Friday Jun-22-2012 20:52:55 PDT Buy It Now for only: $2.76 Buy It Now | Add to watch list |
 David Benioff When The Nines Roll Over 2005 Used $2.79 End Date: Sunday Jun-17-2012 8:51:54 PDT Buy It Now for only: $2.79 Buy It Now | Add to watch list |
 When Its Spring Time In The Rockies QRS 4916 Piano Roll Waltz $6.99 End Date: Monday May-28-2012 20:17:48 PDT Buy It Now for only: $6.99 Buy It Now | Add to watch list |
 Damita Jo If You Go Away When The Fog Rolls In 45 RPM $7.00 End Date: Sunday Jun-10-2012 16:11:26 PDT Buy It Now for only: $7.00 Buy It Now | Add to watch list |
 Sheriff When Im With You Give Me Rock And Roll $4.00 End Date: Tuesday Jun-19-2012 16:59:46 PDT Buy It Now for only: $4.00 Buy It Now | Add to watch list |
 When the Nines Roll Over And Other Stories David Benioff New Book $7.03 End Date: Sunday Jun-17-2012 17:40:48 PDT Buy It Now for only: $7.03 Buy It Now | Add to watch list |
 Vintage Imperial Piano Word Roll Dont Sing Aloha When I Go 06343 $3.50 End Date: Wednesday Jun-13-2012 18:35:53 PDT Buy It Now for only: $3.50 Buy It Now | Add to watch list |
 Deep Purple When We Rock We Rock When We Roll We Roll Audio CD $7.28 End Date: Friday Jun-22-2012 18:19:20 PDT Buy It Now for only: $7.28 Buy It Now | Add to watch list |
 Deep Purple When We Rock We Rock When We Roll We Roll $5.39 End Date: Tuesday Jun-19-2012 19:14:57 PDT Buy It Now for only: $5.39 Buy It Now | Add to watch list |
 Deep Purple When We Rock We Rock And When We Roll We Roll CD $4.95 End Date: Friday Jun-22-2012 18:26:50 PDT Buy It Now for only: $4.95 Buy It Now | Add to watch list |
 Deep Purple When We Rock We Roll LP Album Warner Bros $7.95 End Date: Saturday Jun-23-2012 16:55:26 PDT Buy It Now for only: $7.95 Buy It Now | Add to watch list |
 Ill Be With You When The Clouds Roll By Joe Whitehead 1920 vintage sheet music $7.99 End Date: Saturday May-26-2012 12:48:32 PDT Buy It Now for only: $7.99 Buy It Now | Add to watch list |
 SHERIFF When Im With You b w Give Me Rock N Roll capitol 45 7 single vinyl $3.99 End Date: Thursday Jun-14-2012 14:31:45 PDT Buy It Now for only: $3.99 Buy It Now | Add to watch list |
 Nick Lowe I Knew The Bride When She Use To Rock Roll $5.00 End Date: Saturday Jun-16-2012 9:36:05 PDT Buy It Now for only: $5.00 Buy It Now | Add to watch list |
 When We Rock We Rock When We Roll We Roll by Deep Purple CD Oct 1988 $5.00 End Date: Saturday Jun-16-2012 22:28:49 PDT Buy It Now for only: $5.00 Buy It Now | Add to watch list |
 He Leadeth Me When The Roll Is Called Up Yonder Hayden Quartet Victor 16749 $3.49 End Date: Sunday May-27-2012 23:23:51 PDT Buy It Now for only: $3.49 Buy It Now | Add to watch list |
 Deep Purple When We Rock We Rock When We Roll We Roll $5.16 End Date: Monday Jun-18-2012 9:34:37 PDT Buy It Now for only: $5.16 Buy It Now | Add to watch list |
 QRS Word RollIT ONLY HAPPENS WHEN I DANCE WITH YOU 8397 Player Piano Roll $4.22 End Date: Monday May-28-2012 22:38:13 PDT Buy It Now for only: $4.22 Buy It Now | Add to watch list |
 Mills Brothers 45 When The Roll Is Called Up Yonder Christian $5.24 End Date: Wednesday May-30-2012 15:16:49 PDT Buy It Now for only: $5.24 Buy It Now | Add to watch list |
 Spiderman action figure 2003 fighting with DOC Marvel Decopac spins when roll $3.00 End Date: Friday May-25-2012 19:37:53 PDT |
 When We Get to Surf City A Journey Through America in Pursuit of Rock and Roll $4.50 End Date: Friday Jun-8-2012 16:54:05 PDT Buy It Now for only: $4.50 Buy It Now | Add to watch list |
 QRS WORD ROLL WHEN THE LIGHTS GO ON AGAIN FOX TROT $5.99 End Date: Sunday May-27-2012 18:46:41 PDT Buy It Now for only: $9.99 Buy It Now | Bid now | Add to watch list |
 Damita Jo Epic 10061 When the Fog Rolls in to San Fran $5.00 End Date: Thursday Jun-21-2012 14:50:29 PDT Buy It Now for only: $5.00 Buy It Now | Add to watch list |
 When nothing stands between you open sky Rolls Royce ad 1980 $8.95 End Date: Thursday May-31-2012 23:42:11 PDT Buy It Now for only: $8.95 Buy It Now | Add to watch list |
 DAMITA JO IF YOU GO AWAY WHEN THE FOG ROLLS IN TO SAN FRANCISCO 45 NEAR MINT $5.00 End Date: Tuesday Jun-12-2012 20:34:32 PDT Buy It Now for only: $5.00 Buy It Now | Add to watch list |
 Where Or When Aeolian 1044 Player Piano Word Roll $5.99 End Date: Saturday May-26-2012 5:37:52 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 Please Dont Talk About Me When Im Gone Aeolian 1492 Player Piano Word Roll $5.99 End Date: Saturday May-26-2012 5:39:35 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 When You Are Thinking Of Me Connorized 6933 Player Piano Roll $5.99 End Date: Saturday May-26-2012 5:58:35 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 When I Look Into Your Wonderful Eyes Connorized 6919 Piano Roll $5.99 End Date: Saturday May-26-2012 5:59:21 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 When I Send You A Piacture Of Berlin Ideal 3922 Player Piano Roll $5.99 End Date: Saturday May-26-2012 6:07:21 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 When You Waltz With The One You Love Imperial 06331 Player Piano Roll $5.99 End Date: Saturday May-26-2012 6:15:52 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 When You Wore A Tulip And I Wore A Big Red Rose QRS 1435 Player Piano Roll $5.99 End Date: Saturday May-26-2012 6:34:58 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 When I Grow Too Old To Dream QRS 6080 Player Piano Roll $5.99 End Date: Saturday May-26-2012 6:43:32 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 When Its Springtime In The Rockies QRS 4916 Player Piano Roll $5.99 End Date: Saturday May-26-2012 6:43:33 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 When I Take My Vacation In Heaven QRS 5976 Player Piano Word Roll $5.99 End Date: Saturday May-26-2012 6:50:51 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 When Your Hair Has Turned To Silver QRS 5075 Player Piano Word Roll $5.99 End Date: Saturday May-26-2012 6:51:23 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 When You Were Sweet Sixteen QRS 8256 Player Piano Word Roll $5.99 End Date: Saturday May-26-2012 6:57:47 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 Please Dont Talk About Me When Im Gone QRS 9135 Player Piano Word Roll $5.99 End Date: Saturday May-26-2012 7:04:31 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 When My Sugar Walks Down The Street QRS 9514 Player Piano Word Roll $5.99 End Date: Saturday May-26-2012 7:05:52 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 When The Red Red Robin Comes Bobbin Along QRS Q 183 Player Piano Word Roll $5.99 End Date: Saturday May-26-2012 7:24:49 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 When You And I Were Seventeen Pianostyle 23012 Player Piano Roll $5.99 End Date: Saturday May-26-2012 7:50:57 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 When You And I Were Young Maggie Pianostyle 10503 Player Piano Roll $5.99 End Date: Saturday May-26-2012 7:51:26 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 When The One You Love Loves You US 42585 Player Piano Roll $5.99 End Date: Saturday May-26-2012 8:09:37 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 When The Harvest Moon Is Shining Vocalstyle 11636 Song Roll $5.99 End Date: Saturday May-26-2012 8:20:36 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 When Im Gone Youll Soon Forget Supertone 5131 Piano Roll $5.99 End Date: Sunday May-27-2012 15:01:07 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 When I Look In Your Wonderful Eyes Melodee 3929 Player Piano Song Roll $5.99 End Date: Sunday May-27-2012 15:05:22 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 When You And I Were You Maggie Deluxe 15135 Player Piano Roll $5.99 End Date: Sunday May-27-2012 15:17:23 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 WHEN THOSE SWEET HAWAIIAN BABIES ROLL THEIR EYES 1917 LF Sheet Music HUSSEY WO $5.39 End Date: Tuesday Jun-12-2012 4:28:57 PDT Buy It Now for only: $5.39 Buy It Now | Add to watch list |
 INTERNATIONAL WHEN YOU AND I WERE SEVENTEEN 92862 Word Player Piano Roll $5.22 End Date: Monday May-28-2012 13:36:03 PDT Buy It Now for only: $5.22 Buy It Now | Add to watch list |
 QRS Word Roll WHEN THE ORGAN PLAYED AT TWILIGHT 5009 Hand Played Piano Roll $5.22 End Date: Monday May-28-2012 22:13:17 PDT Buy It Now for only: $5.22 Buy It Now | Add to watch list |
 You Only Want Me When Youre Lonesome Mel O Art 1235 Piano Roll $5.99 End Date: Sunday May-27-2012 10:05:04 PDT |
 JAMES YORKSTON WHEN THE HAAR ROLLS IN CD $9.64 End Date: Saturday Jun-2-2012 23:48:27 PDT Buy It Now for only: $9.64 Buy It Now | Add to watch list |
 1920 ILL BE WITH YOU WHEN THE CLOUDS ROLL BY SHEET $5.95 End Date: Monday Jun-4-2012 9:50:59 PDT Buy It Now for only: $5.95 Buy It Now | Add to watch list |
 BOB DEWEY WHEN IM GONE PIANO ROLL BOOGIE 45 MINT $5.75 End Date: Thursday Jun-14-2012 19:36:38 PDT Buy It Now for only: $5.75 Buy It Now | Add to watch list |
 1920 ILL BE WITH YOU WHEN THE CLOUDS ROLL BY Kuhns $6.50 End Date: Wednesday May-30-2012 18:42:39 PDT Buy It Now for only: $6.50 Buy It Now | Add to watch list |
 1920 Three White Kuhns WHEN the CLOUDS ROLL BY Starmer $5.99 End Date: Sunday Jun-3-2012 7:54:37 PDT Buy It Now for only: $5.99 Buy It Now | Add to watch list |
 When My Sugar Walks Down The Street QRS Word Roll 9514 $5.95 End Date: Monday Jun-18-2012 4:47:37 PDT Buy It Now for only: $5.95 Buy It Now | Add to watch list |
 Prevent sprinkles when you tinkle on toilet 2 Rolls $9.95 End Date: Tuesday May-29-2012 18:31:26 PDT Buy It Now for only: $9.95 Buy It Now | Add to watch list |
 Vocalstyle Player Piano Roll When You I Were Young Magg $9.97 End Date: Thursday May-31-2012 16:17:56 PDT Buy It Now for only: $9.97 Buy It Now | Add to watch list |
 Player Piano Roll When I Take My Sugar To Tea 9753 $9.97 End Date: Thursday May-31-2012 16:18:03 PDT Buy It Now for only: $9.97 Buy It Now | Add to watch list |
 Gimbel Bros Player Piano Roll When Its Love In Hawaii $9.97 End Date: Thursday May-31-2012 16:18:03 PDT Buy It Now for only: $9.97 Buy It Now | Add to watch list |
 QRS Player Piano Roll When the Poppies Bloom Again $9.97 End Date: Thursday Jun-14-2012 8:37:37 PDT Buy It Now for only: $9.97 Buy It Now | Add to watch list |
 QRS Player Piano Roll When I Take Vacation in Heaven $9.97 End Date: Thursday Jun-14-2012 8:37:37 PDT Buy It Now for only: $9.97 Buy It Now | Add to watch list |
 Playrite Player Piano Roll You Only Want Me When Youre Lonesome $9.97 End Date: Thursday Jun-14-2012 8:47:53 PDT Buy It Now for only: $9.97 Buy It Now | Add to watch list |
 QRS Player Piano Roll When You Look In The Heart Rose $9.97 End Date: Saturday Jun-23-2012 9:46:38 PDT Buy It Now for only: $9.97 Buy It Now | Add to watch list |
You can also check out Amazon for information on Roll When.
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Thread Rolling - comparison between technologies
The following article will compare the following most common thread rolling systems:
• Flat die machines, using two flat thread rolling dies.
• Planetary (Rotary) die machines, using one circular die and one segment die.
• Circular Die (2-roll) machines, using two circular dies.
Each threading system has its advantages and disadvantages.
Some parts are more efficiently rolled on one system, while others can be rolled on two or even three thread systems.
The decision on which system would be best depends on the thread size, thread length, material hardness, required accuracy, budget, batch size, etc.
The major question is therefore which system will yield the best result and will be the most cost effective? Flat die machines are the most conventional system for rolling threads. The flat die machines are simple to use and setup and the thread dies are inexpensive. However, most machines are quite slow and have high maintenance costs due to the need to overhaul the ram every few years to keep the accuracy. The number of revolutions that a blank passes in between the dies determines the thread quality and die life. A good number of revolutions is 6, while harder blanks need more revolutions and softer parts require fewer revolutions.
The die size has a considerable effect on the machine size and cost, and for this reason, in most flat die machines, the blanks will turn fewer revolutions then on any other system. The number of revolutions will have bigger effect on larger thread sizes, over M-10. The thread length in flat die machines is also restricted by the size of the machine. Thread length on flat die machines is usually in the range of 60-100mm, with some machines on the market going up to 150mm. Flat dies are usually inexpensive, and are especially worthwhile to use when rolling complex forms, wood screw threads, etc. 2 Circular Die (2-Roll) machines are divided into two categories: Plunge-Feed (In-Feed) machines, where the two dies are parallel to each other and the blank is rolled between the rolls that close on it while rotating and form the thread. Through-Feed machines, where the blanks are fed into the dies while the dies are usually closed. The blanks enter the dies from one side and leave the dies from the other side, threading the part all along. It is possible to use the through feed machine for partial threading by opening the dies after the blank has passed the required thread length.Plunge-Feed machines have no restriction to the number of revolutions of the parts in between the dies and they are, therefore, used for rolling hard materials and parts that require more revolutions of the blanks in between the dies. Some Plunge-Feed machines are equipped with CNC control, which allows to change the roll speed in the various stages of thread rolling, thus enabling to start rolling in slow speed and increase the speed once the blank is firmly gripped in between the dies. Through-Feed systems are used for rolling unlimited length and is practically the only available system on the market for rolling long threads. Through-Feed machines are available with either parallel shafts or tilting shafts. The parallel shafts accept thread rolling dies with a helix angle while the tilting shafts can accept either dies with parallel rings or speed-up dies with a helix angle, for faster feed rates. Some Circular-Die machines can be used in both Plunge or Through- Feed modes, and also in a combined Plunge-Feed and Through-Feed mode. 3 Planetary (Rotary) die machines are also divided into the following: Conventional planetary machines, which are mostly popular for fast rolling high volumes of machine threads in reasonable quality and low maintenance cost. New models with Controlled-Feed and Closed-Frame system, enabling to roll quality threads also on pre-hardened fasteners, as well. The Closed-Frame machines offer lower die cost-per-piece then on any other system. Videx has been specializing in planetary machines since 1973. Recent developments in the feed system and machine construction, show impressing improvements in both thread quality and die life. The Controlled-Feed mechanism is pushing the blanks in between the dies in at a perfect timing, and at a predetermined speed, which is the speed of the rotary die. In Flat Die machines the blanks are fed into the dies from a rest position when the ram is at the back position. To feed the blank, the ram moves forward and the blanks are accelerated to full speed in a fraction of a second. A flat die machine that rolls 300 parts per minute is actually performing 600 back and forth movements. At this speed, the whole stroke is completed in less than 0.1 second, meaning that the blanks are accelerated from rest to full speed in less then one hundreds of a second (0.01 second). Such acceleration results in some inevitable slippage between the threading dies and the blanks. This problem becomes more evident for larger and heavier parts. A new model planetary machine that rolls 300 PPM is turning at 75 RPM and the line rolling speed of the blanks is only fractional to the speed of a flat die machine. in most Circular-Die machines, the blanks also start from rest and are accelerated to full speed in a fraction of a second, creating the same trouble. Some CNC controlled modes are designed to slow down while the dies close on the blanks to overcome this problem. In most old Planetary machines on the market, the blanks are fed into the dies starting from rest position. To overcome the slippage problem, Videx has developed a mechanism that speeds up the blanks to the circumferential speed of the rotary die, so the blanks are fed in between the dies when they are already at the same speed as the rotary die, preventing such slippage. The Videx Controlled Feed system also squares the blanks before feeding, making sure the parts are fed parallel to the threading dies. This feature is specially important for long parts or parts with heavy heads, etc. 4 Rolling long threads Flat Die machines Rolling long threads on Flat Die machines is restricted by the height of the die. Most flat die machines offer thread length up to 4", with few machines going up to 6". The higher die pocket requires the Flat Die machines to have a much heavier frame, resulting in a slower and more expensive machine, with higher maintenance costs. Circular Die machines Most Plunge-Feed machines are equipped with longer die pockets then Flat Die machines and are therefore more suitable for rolling long threads. However, the Circular Die machines are considerably slower then Flat Die machines, due to the fact that the parts are fed and ejected from above, requiring the operator (or in some cases the automatic feed system) to wait with the next blank until the part in process has been ejected. Through-Feed machines are faster when rolling fully threaded parts which are fed one after the other. When rolling long threads on headed parts or when the thread is not rolled on the entire length of the part, the parts can be through fed into the machine until the desired length is achieved and then the dies open. The disadvantage of this mode is that the last few pitches are incomplete because the blank is not rolled through the entire die. Planetary (Rotary) machines In Planetary machines, the parts enter the dies from one side and leave the dies on the other side, so rolling long threads requires long die pocket and longer spindle. Most conventional planetary thread rollers on the market offer only 80-100mm thread length because longer die pockets are more complicated due to the deflection of the spindle and a thicker main spindle is more expensive and usually requires using more expensive dies. The spindle in the new planetary VA-ES models from Videx is supported on both ends, quite similar to the construction of Circular-Die machines. This closed-structure offers the advantages of the Circular-Die machines with the speed and reliability of the planetary system. With the supported spindle, the VA-ES have practically unlimited die pocket, and Videx has already sold machines with 200mm and 300mm die pockets. Data collected on die life when rolling long threads shows an increase in die life up to 4 times comparing to conventional planetary machines. The increase in die life is most evident when rolling hi-tensile fasteners. Videx is also offering dual and triple spindle machines for Wheel Bolts, etc. The multiple spindle thread rollers are also rolling grooves, chamfers and knurls prior to thread rolling and also allow thread rolling two different threads on the same part. 5 Summary of advantages and disadvantages of all 3 systems: Cost: Flat dies cost less and roll fewer parts then circular or planetary dies. They also require a more frequent change of the dies and more down time of the machine. In small diameters up to M-5, the cost per piece may be cheaper on Flat dies. For larger diameters and higher tensile, the cost per piece in the Controlled Feed and Closed-structure Planetary models is 1/2 to 1/5 then the rolling cost onflat dies. Reliability and Maintenance: Flat Die machines should be overhauled from time to time to keep them running accurately. For this reason, they are the most costly in maintenance with the longerdown time of all systems. Circular Die machines require little mechanical maintenance but some of them have hydraulic systems that may require maintenance. The new models of Planetary machines have no slides and no hydraulics and therefore require very little to no maintenance. The main spindle runs inside taper roller bearings that can be tightened from time to time thusthe machine keeps its accuracy even after 20 years of operation. Speed: Planetary systems are 2-3 times faster then Flat Die machines and up to 10 times faster then Circular-Die machines. Set-up time: The set-up time is comparable on all 3 systems when using appropriate tooling. Circular-Die machines using automatic feeding systems may take longer to set. 6 Rolling Hi-Tensile fasteners: Circular-Die machines offer unlimited number of revolutions and are therefore ideal when rolling parts harder then 40 Rc. Planetary closed-structure machines will yield the best "price per piece" ratio of all 3 systems. When rolling bigger threads, the Planetary Die system offers in average, 50% more revolutions of the part in between the dies compared to Flat Die machines. Threading complex shapes: Flat die machines are the most practical solution for rolling complex shapes in low and medium tensile fasteners because the dies are the simple to design and make. When rolling hi-tensile parts, Circular Die machines will have an advantage due to their ability to roll morerevolutions on the part. Planetary system is ideal for threading and knurling but has no advantage when rolling complex shapes. Rolling long threads: The Videx closed-structure models are available with diepockets up to 12", and is the most efficient and inexpensive way to roll long threads in larger and medium size batches of production. Circular Die machines are also availablewith long die pockets and are a good solution for small quantities. Thread quality: Good quality machines will roll good quality parts. The Videx Controlled Feed system assures perfect thread quality also for hard to feed parts. Machine cost: When comparing complete machines with their feed systems, the planetary machines will cost less then a good flat die machine or even a Circular-Die machine. Comparing to Taiwanese machines, the planetary machines will pay for the difference in cost in less then a year just by the saving in die life. The longer the customer keeps the machine, the more saving he will have due to the no maintenance needs in the planetary machines. 7 Production: Planetary machines will run twice as fast as a Flat Die and up to 10 times faster then a Circular-Die machine. Floor space & power consumption: Planetary machines require less floor space and ½ the power consumption per piece compared to Flat Die machines as it has no back stroke and further less power then CircularDie machines which need to open and close with noisy hydraulics. Process Monitoring: Flat die machine and Planetary die machines are using different models of monitors, but in both systems it is possible to control the thread quality just as good. Orientation: In Plunge-Feed Circular Die machines, the parts are fed into the dies and out of the dies from above, thus requiring a special feed system. In Planetary machines, the parts get into the dies in one side and leave the dies on the other side, already oriented for the next production step. This feature allows combining the thread rolling system with other operations as part of a line and allowed Videx to produce the multiple spindle machines for headed parts and the fully automatic machine working from coil. In Flat Die machines the parts also get into the dies in one side and leave the dies on the other side, but due to the movement of the ram, the parts can not be oriented. Floor Space: The planetary machines require less floor space then any other system
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