If you are using any tubing bender and having issues with bend quality and deformation, you have come to the right place. We will help you learn how to measure and calculate your bend quality, and also how you can improve the bend quality you are getting on your M600 Tubing Bender (standard or Mandrel). You will need calipers to perform these measurements.
Bend Quality Defects:
What causes them- D ratio too low, wall ratio too high, clamp block slipping, machine set up wrong.
What causes it- D ratio too low, wall ratio too high, clamp block slipping, machine set up wrong.
Bump at Bend Start
What causes it- D ratio too low, wall ratio too high.
What causes it- D ratio too low, wall ratio too high, or mandrel too far forward on mandrel applications. This is much more common on aluminum.
D Ratio Too Low
Wall Ratio Too High
Machine Set Up Wrong
Including full operation instructions here is not practical, but we will tell you the most common set up mistake made that affects bend quality is using a pressure die in the back of the machine (this hole is labeled “HD, never use on .120 wall or thinner”). If you are mandrel bending, the most common set up problem is mandrel position. Getting the perfect mandrel position will be the result of running several test bends with recordings of achieved bend quality and mandrel position used.
Clamp Block Slipping
The clamp block usually slides when it is clamped on dirty/oily material, or If your material kinks/wrinkles. Kinks can cause the clamp block to slide when the material binds up in the machine. The clamp block slipping can also cause wrinkles, so it can be either a cause or a symptom. The solution is simple. If your clamp block has grooves/scratches from sliding, they must be removed. Recondition the surface with 220 grit sandpaper or emery cloth, rubbing the same way twisting the tube would rub the surface. Only a few light passes until the offending slip lines are gone (no more). Now clean it with laquer thinner or acetone and a clean rag. Do not use any other cleaner. Clean your tubing at the clamp location the same way. We know this is extra work. Doing things right usually is. Now follow the clamping instructions, keeping bolt torque even. Remember that sliding oily tubing through your clamp blocks not only scratches them, but fills in those scratches with oil. Clamp blocks are extremely affordable, so keep that in mind for spares and/or replacements. We have not yet seen an application (even with the added drag from a mandrel) where one clean clamp was not enough clamping force.