Technical Support

Salvo Tool can assist in trouble shooting your job. Please do not hesitate to call us at (810) 346-2727 for Technical assistance.

Operator’s Check List of Problems

Problem Possible Causes:
Two Roll Set-up One Roll Set-up
Slivers or Flakes in Threads.
  • Rolls are not synchronized.
  • Attachment not square with the spindle.
  • Loose or worn cross slide.
  • Seams in bar stock.
  • feed rate too slow causing attachment to walk.
  • Incorrect roll diameter
  • Rolls are not Synchronized.
  • Center of roll is not parallel with the Center of the spindle.
  • Loose or worn cross slide.
  • Overfilling the roll.
  • Seams in bar stock.
  • feed too slow.
  • Incorrect roll diameter.
Drunken Threads
  • Rolls are not synchronized.
  • Center of the Rolls are not Parallel with the center of the spindle
  • Part bending while rolling.
  • Incorrect thread rolls.
  • Center of the roll is not parallel with the center of the spindle.
  • Part bending while rolling.
  • Incorrect thread roll.
Off Size Threads
  1. P.D. & O.D. both over size.
    • Over size blank diameter.
  2. P.D. over size & O.D. under size.
    • Gap between rolls too large, close opening.
  3. P.D. correct & O.D. over size.
    • Blank too large.
  4. P.D. correct & O.D. under size.
    • Blank too small.
  5. P.D. under size & O.D. correct.
    • Roll gap too small.
  6. P.D. & O.D. both under size.
    • Blank too small and gap between rolls too small.
  1. P.D. & O.D. both over size.
    • Over size blank.
  2. P.D. over size & O.D. under size.
    • Move roll closer to center.
  3. P.D. correct & O.D. over size.
    • Blank diameter too large
  4. P.D. correct & O.D. under size.
    • Blank diameter too small
  5. P.D. under size & O.D. correct.
    • Move roll back from the center.
  6. P.D. & O.D. both under size.
    • Blank too small and too close to the center.
Non-Concentric Threads
  • If the number of threads on the part is less than 7, then the thread length must be adjusted so that the number of threads is 1/2 a pitch off from a whole number of threads. Such as: 3.5, 4.5, 5.5.
  • If the number of threads on the part is less than 7, then the thread length must be adjusted so that the number of threads is 1/2 a pitch off from a whole number of threads. Such as: 3.5, 4.5, 5.5.
Tapered Threads
  1. P.D. Straight & O.D. Tapered
    • Blank O.D. is tapered.
    • Large hole under thread.
  2. P.D. & O.D. Tapered in opposite direction.
    • Adjustable thread roll improperly set.
  1. P.D. Straight & O.D. Tapered
    • Blank O.D. is tapered.
    • Large hole under thread.
  2. P.D. & O.D. Tapered in opposite direction.
    • Attachment not square.
Threads with Expanded Lead
  • Some materials stretch when roll formed. Stainless frequently stretches, special rolls are needed.
  • Some materials stretch when roll formed. Stainless frequently stretches, special rolls are needed.
Poor Thread Form
  • Blank bending while rolling.
  • Rolls are not Synchronized.
  • Feed too slow, too many revolutions on part.
  • Attachment out of square with spindle.
  • Blank bending while rolling.
  • Feed too slow.
  • Restriction of lateral roll float.
  • Center of Roll is not Parallel with the center of the spindle.
Threads’ fill not consistent across the whole part
  • Blank bending while rolling.
  • Variation over width of blank.
  • Large hole under rolling surface.
  • Attachment out of square with slide.
  • Center of the Rolls are not Parallel with the center of the spindle.
  • Blank bending while rolling.
  • Blank is not straight.
  • Attachment out of square with spindle.
  • Hole collapsing, finish hole after rolling.
Part appears cracked or split.
  • Material has seams or laps.
  • Material has seams or laps.
Poor finish on thread.
  • Over filling rolling dies.
  • Chips from other tooling getting between thread rolls and blank.
  • Rolls are chipped or broken.
  • Rolls are not synchronized.
  • Over filling rolling die.
  • Chips from other tooling getting between thread rolls and blank.
  • Rolls are chipped or broken.
Crest not filled out.
  • Blank is too small.

*(Many users do not consider this a serious objection and by allowing their threads’ crest to not fill out, over filling is eliminated and roll life is prolonged.)

  • Blank is too small.

*(Many users do not consider this a serious objection and by allowing their threads’ crest to not fill out, over filling is eliminated and roll life is prolonged.)

Scuffed Threads.
(Marked by rolling dies retracting.)
  • Return cam worn (Not retracting fast enough).
  • Rolls and/or gear train is binding.
  • Rolls are going past center.
  • Rolls are the wrong diameter.
  • Return is not fast enough.
  • Roll is on part too long.
  • Roll or blank is wrong diameter.
Hollow Work
  1. Hole closes in.
    • Finish hole after rolling.
    • Feed may be too fast.
  2. Hole enlarges.
    • Do not roll while drilling.
    • Finish hole after rolling.
  3. Tapered threads(Due to uneven wall thickness or support from adjacent section).
    • Finish hole after rolling.
    • Re-adjust taper in the adjustable roll.
  1. Hole closes in.
    • Finish hole after rolling.
    • Feed may be too fast.
  2. Hole enlarges.
    • Do not roll while drilling.
    • Finish hole after rolling.
  3. Tapered threads(Due to uneven wall thickness or support from adjacent section).
    • Finish hole after rolling.
    • Re-adjust taper in the attachment.

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