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A DIY Powered Benchtop Tapping Machine

Howdy Guy’s and Gal’s!

It’s my turn now to contribute to the site with a tool that I consider a “must-have” for the home shop machinist. A powered benchtop threading/tapping machine!

For some 25 years I have used this simple tapping machine in my workshop. One of my old colleagues invented it more than 40 years ago and he gave it to me when he retired.

I know he never serviced the machine, and haven’t needed to service it either, so it’s definitely proven to be a durable design.

The function is simple push / pull action, you can see short video her on YouTube:

The drive mechanism is a rubber wheel pushed over the driveshaft on the electric motor.

Once you get the motor spinning in the correct direction (it always seems to start the wrong way the first time … thank’s Murphy) you just push the workpiece against the tap, and the rotation starts. The harder you push the higher torque. I have made M2 – M8 threads primarily in sheet metal.

I have made some different guide-plates to fit different tap sizes and workpiece shapes.

I also made some photos, sorry I did not clean this “old Lady” before her photo session.

 

STM

Simple Tapping Machine by SD Denmark
SIDE

The electric motor used her is 3 phase 1400 rpm, I think this gives the perfect cutting speed.

STM

Simple Tapping Machine by SD Denmark
TOP

hmmm what can I say… seen from top..

STM

Simple Tapping machine by SD Denmark
FRONT

I have mounted the tapping machine on old iron table to give it some weight to prevent it from moving around when in use. But I also like having the option to store it when not in use. (I couldn’t find any space on my workbench ;-) )

 

 

Download the Tapping Machine Plans:

Plans for this small device are available in following formats.

Plans in PDF format (dimensions in mm, and 2nd dim’s is imperial, sorry for the awkward imperial dim’s, it’s designed in mm)

  Threading_Machine_Plans (1.4 MiB, 1,332 downloads)
NOTE: You need to be a registered member (and logged in) to download this file.

  • HOW? You can register using the yellow "Register" link in the upper right corner of the website. If you've registered previously you just need to log in using the "Have an account? Log In" link located in the upper right corner of the site.
  • COST? It's currently free to register and become a member of this site.
  • PRIVACY? Your email address will be encrypted and kept private.

    YOU WILL NOT RECEIVE SPAM FROM THIS SITE!

  • BENEFITS? Registering for the site allows you to download plans and other documents. Registering will also grant you forum access, allowing you to log into the forum using the same username and password you used to register for the site.
  • RSS? Subscribing to the RSS feed or subscribing to receive email messages whenever the site content is updated is not the same as registering. If you would like to receive email notifications you still need to sign up for that service. AND WE STILL WON'T SPAM YOU! We will, however, send you an email whenever the site is updated with new content. That's typically about 1 email a month or less.

STEP file

  Threading_machine-STEP.rar (752.9 KiB, 443 downloads)
NOTE: You need to be a registered member (and logged in) to download this file.

  • HOW? You can register using the yellow "Register" link in the upper right corner of the website. If you've registered previously you just need to log in using the "Have an account? Log In" link located in the upper right corner of the site.
  • COST? It's currently free to register and become a member of this site.
  • PRIVACY? Your email address will be encrypted and kept private.

    YOU WILL NOT RECEIVE SPAM FROM THIS SITE!

  • BENEFITS? Registering for the site allows you to download plans and other documents. Registering will also grant you forum access, allowing you to log into the forum using the same username and password you used to register for the site.
  • RSS? Subscribing to the RSS feed or subscribing to receive email messages whenever the site content is updated is not the same as registering. If you would like to receive email notifications you still need to sign up for that service. AND WE STILL WON'T SPAM YOU! We will, however, send you an email whenever the site is updated with new content. That's typically about 1 email a month or less.

Renderings

  Threading_machine-renderings.rar (389.0 KiB, 937 downloads)

SolidWorks files on request – send me (stranix) a private message via the forum system.

If you have any feedback I’d love to hear it!

– Brian Madsen (aka stranix)

 

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