Rotary Tool Cutoff Saw

by Vector_Mayhem, published

Rotary Tool Cutoff Saw by Vector_Mayhem Feb 6, 2012

Thing Info

31122Views 3749Downloads Found in Machine Tools
Report Thing


I designed this to be able to use my Dremel tool & extension shaft as a small cutoff saw. It can cut about 1/4" (6mm) diameter stock in a single cut, or 1/2" (13mm) by turning the stock.
Requires an extension shaft with a 1/2" diameter handpiece; unfortunately, a lot of the extension shafts currently available have contoured handpieces and won't work.
ZIP file contains source files from Solidworks 2011.


You will also need a 4" (100mm) length of 5/16"(8mm) rod, a 6-32 or M4 screw to hold the handpiece, a 3/8" OD x 1.5" long spring, and a 2"x4"(50mmx100mm) piece of clear plastic for a guard.
Ream the 5/16" hole in the base for a tight fit on the rod, and ream the hole in the arm for a slip fit. Assemble the base and arm with the rod, and put the spring into the spring pockets. Put a 90 degree bend into the guard, and attach the guard to the arm with a small screw. I used 1 screw, so the guard can be rotated off to the side to tighten the cutoff disc to the handpiece. I used 3mm acrylic because I have a bender & lots of scrap; lighter plastic would be ok too.
I would recommend attaching the saw to a sturdy flat base to keep everything from flexing and tipping.
Use 1.25" reinforced cutting discs.

More from Machine Tools

view more

Thing Info

31122Views 3749Downloads Found in Machine Tools
Report Thing

Liked By

View All

Give a Shout Out

If you print this Thing and display it in public proudly give attribution by printing and displaying this tag. Print Thing Tag

All Apps

This App connects Thingiverse with Makeprintable, a cloud-based mesh repair service that analyzes, validates and repairs most common mesh errors that can occur when preparing a 3D design file for p...

App Info Launch App

Kiri:Moto is an integrated cloud-based slicer and tool-path generator for 3D Printing, CAM / CNC and Laser cutting. *** 3D printing mode provides model slicing and GCode output using built-in...

App Info Launch App
KiriMoto Thing App

With 3D Slash, you can edit 3d models like a stonecutter. A unique interface: as fun as a building game! The perfect tool for non-designers and children to create in 3D.

App Info Launch App

Nice design. One small problem is heat transfer down the piece being cut is enough to melt the plastic base! I simply added a thin layer of balsa wood to the V-block which is enough insulation to keep the plastic from melting while cutting a S.S. rod.

Hello will this work with any dremel or a specific one ? thanks

This is very cool, printed it. Unfortunately it does not fit my "newer" Dremel extension.
With the one I have you can unscrew the front part. I will rework your upper part to fit my extension (so I can screw it in) and share the results.

does this mean my pos from ebay that was bought by someone from harborfreight is now obsolete ? ha ha .. naw but this def can do smaller scale stuff ..

This should be featured, very nice!

Could you post your extension shaft diameter and the hole diameter where it fits? I have the new version of the Dremel shaft extension 225, but as you said it is contoured :(

1/2" = 12.7mm

Can you please upload all of the STLs? I would love to make this.

I love the end of that flex cable attachement. Mine has an ergonomic shape, its hell to design an attachement for. Could you please give us more details about it? Were did you buy it?

Mine is the older version of the Dremel 225. I don't know when the design changed, but the instructions for mine have a rev date of 2000.  You can still find the old version on ebay, I'm pretty sure the ones that come in a cardboard box (rather than the blister pack) are the old design.

Awesome! Too bad the 255-01 flex shaft doesn't fit.

Nicely done! :-D

This is fantastic! Thanks!