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Sieg SX2.7 Shop Built Powerfeed/Control System

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Benjmain Poweski13/01/2020 14:56:57
4 forum posts
7 photos

I thought some might be interested in my take on a powerfeed for the Sieg SX2.7. While there is one for purchase it's a little more than something i'd purchase outright @ £275.

My design goals:

1. X axis - standard powerfeed functionality

2. Ability to dial in a specific feed rate

3. Ability to return to the prior position at a faster speed

4. Ability to raise & lower the Z axis. It's rather annoying on this mill and on the Sieg cabinet slightly wobbly due to the torque required to lift the weight.


1. CNC

Stretch goals:

1. Ability to later expand the system to build a rotary indexer

2. Ability to automate aspects of rotary indexing via software updates

What I came up with:

1. Stepper driven powerfeed design on the X & Z axis

2. Arduino/AVR control system

3. X axis motor mount & shaft adapter for the Sieg powerfeed clutch

4. Z axis shaft & motor mount (replaces the handwheel)

2. Utilize an arduino compatible board to drive

Benjmain Poweski13/01/2020 15:09:43
4 forum posts
7 photos

This is the mounted clutch, stepper & motor mount

Stepper Mounted on Clutch


Motor Mount

This is the control box design I came up with:

- momentary toggle for z-axis

- momentary toggle for x-axis

- static directional toggle

- 2x rotary encoders for various input

- 4x buttons to control various functions

- 16x2 LCD

1. The main control board houses a Teensy 2.0++ board which is an Arduino compatible board but with a large number of IO pins.

2. DB15 interface for main logic to stepper driver enclosure

img_1206 (1).jpeg

This is a close up of the control board I designed.

Boards from fab

Completed Control Board

I'm currently in the process of wiring the electrical enclosure and kicking around a few designs for the Z-axis mount.

Let me know if you're interested. I have schematics and CAD models for parts of it.

-Ben in Edinburgh

JasonB13/01/2020 15:27:00
18598 forum posts
2046 photos
1 articles

Ben, did you make the clutch unit or is that a sieg item as it looks very much like the factory one?

Also what sort od slow feed can you get as the standard one can be a bit fast for heavy cuts?

Edited By JasonB on 13/01/2020 15:28:43

Benjmain Poweski13/01/2020 15:28:01
4 forum posts
7 photos

It's the factory one. The price was quite reasonable so opted to purchase.

Benjmain Poweski15/01/2020 08:00:06
4 forum posts
7 photos

I’m almost done with the x-axis but the design should support a wide range of slow speeds with high torque given the use of a stepper.

Further adjustment can be made by changing the amount of micro stepping in the driver. I opted for an spring style (not sure the correct name) coupler but not sure what the design trade offs are with the fixed or oldham style.

I’ll post more as I make progress.

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