Lmst

#ThreadCutter

Designed and printed a holder for an M20 die that I intended to use for cutting an external thread onto M20 PVC pipe. The holder itself works fine, but the project was a failure: The walls of electrical conduit PVC pipes (in Germany) are too thin to cut an M20 thread on them. They simply curl up at one or more of the blades.
#3DPrinting #Tool #DIY #ThreadCutter

Holder with inserted M20 thread die viewed from the top. In addition to the die fitting in snugly in the holder, a small ridge (is that the right word?) and four M4 screws hold the die in place, preventing it from rotating inside the holder or getting pushed out during operation.

Holder viewed at an angle from the side, with a PVC pipe entering from the end opposite of the die. Three of the four M4 screws holding the die in place are visible. Barely visible are four holes on the top side of the part holding the die; they can be used to push the die out of the holder.
The pipe fits snugly into the holder (but not tightly so it's easy to rotate), centering the pipe inside the die and ensuring it enters the die at a 90° angle for a proper cut. The part holding the pipe is long enough to be used as a handle for holding the thread cutter while rotating and pushing in the pipe.

Partially cut PVC pipe in the die, viewed at an angle from the top. The inner diameter of the die is about the same as the inner diameter of the pipe. At several points long, broad spirals of PVC are visible. Instead of cutting a thread into the pipe, the entire wall has been cut off.

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Version: 2025.04

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