RC Models

Axminster SIEG C1 Micro Lathe Modifications

Replacing the plastic gearbox on our Axminster SIEG C1 Micro Lathe

When we purchased the milling machine which was later converted to be CNC we also purchased a Axminster SIEG C1 Micro Lathe, the lathe was ok for working with larger materials (over 3mm) but due to excessive vibration from the machine when it was running it wasn't possible to work smaller materials and get a consistent finish.

Recently we needed to make some small parts on the lathe and found that it wasn't possible so we decided to see if we can improve it!

Removal of the covers and replacement of various parts narrowed the source of the vibration to the standard pulleys which had over .5mm offset which caused a lot of issues and the motor mount which flexed a lot when under load.

The original machine before starting work.

Axminster SIEG C1 Micro Lathe

The first job was to relocate the electronics and speed controller to allow us to run the lathe with the covers removed. The control board was fitted into a plastic box and was fitted to a shelf above the lathe.

The original cogs, pulleys and motor mounting plate was removed and then scanned so a new mounting plate could be made using 10mm aluminium plate.

View of motor side of new plate with original to the right.

Back of new plate

View of pulley side of the new plate with the two new mounting holes in the top to fit into existing threaded M4 holes in the head stock.

Front view of new plate

Close shot showing new mounting bolts recessed into the new plate.

Top mounting bolts

The new pulleys were cut from a sheet of delryn plastic initially using the milling machine to make the outline, the centres were then bored to the correct size and then the outside of the pulleys were machined on the lathe to make them round and a slot was created to work with the new V belt.

Testing the pulleys and belt.

Testing the pulleys

View of the motor mounted on the new plate.

motor mounted on the new plate

The next stage is to make a second plate the same shape and fit this on spacers to cover the belt drive and then fit a cover over the top and an additional rubber foot below the motor.

The lathe partially reassembled with the speed controller in the top of the photo.

lathe partially reassembled

The mill was purchased from Axmister tools and new materials from ebay and other metal suppliers.



05 January 2020 at 2:57 pm
Hi!! I’ve come across your modifications on your mini lathe C1. What else did you do?

I own one of these and I’ve converted it to CNC. I need to align the headstock slightly with the ways.

Is there an easy way to do it? Do I need to remove the plastic cover, electronics all to be able to find the screws under the spindle case? Did you need to align the headstock of yours?


19 December 2020 at 2:03 pm
Could you post a specification/size of the pulleys made and the v-belt used in this mod.

19 December 2020 at 2:24 pm
Banjo, I am sorry but I can not find the specs of the pulleys from the order.
19 December 2020 at 3:47 pm
Did you made those pulleys similar in size to the original or did you adjust them to fit the new v belt?
19 December 2020 at 4:24 pm
Banjo, I made the metal plate to fit the new pulleys and v belt.

Leave a reply

Your email address will not be published. Required fields are marked *

Share this post

Support the blog

AB Electronics Raspberry Pi shop