Hernault Somua mill with Acorn and DMM servos

Post your completed retrofits for the world to see.

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yellow_submarin
Posts: 17
Joined: Mon Apr 22, 2019 4:54 am
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
CNC Control System Serial Number: C120826

Hernault Somua mill with Acorn and DMM servos

Post by yellow_submarin »

Hi,

My second Acorn project came to life today.

This is an old French mill with a travelling column. I bought it partially converted to CNC with DMM 750W servos and DYN2 drives. I gathered an Intel NUC, an Elo touchscreen and a fresh Acorn.

Right now homing is set with inductive sensors (already had them) and ZRI from the servos. I still need to install a new spindle motor and drive (2.6kw AC servo on the way) and auto lube. A fourth axis and power drawbar will come later.

cnckeith
Posts: 3202
Joined: Wed Mar 03, 2010 4:23 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: Yes
Oak CNC controller: Yes
MPU11 & GPIO4D -w/ 3rd Party Drives: Yes
DC3IOB: Yes
CNC11: Yes
CPU10 or CPU7: Yes
CNC Control System Serial Number: none
Contact:

Re: Hernault Somua mill with Acorn and DMM servos

Post by cnckeith »

Nice! cool machine. thanks for posting, i shared the video on the Acorn Facebook page.
Need support? READ THIS POST first. http://centroidcncforum.com/viewtopic.php?f=60&t=1043
All Acorn Documentation is located here: viewtopic.php?f=60&t=3397
Answers to common questions: viewforum.php?f=63
and here viewforum.php?f=61
Gear we use but don't sell. https://www.centroidcnc.com/centroid_di ... _gear.html
yellow_submarin
Posts: 17
Joined: Mon Apr 22, 2019 4:54 am
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
CNC Control System Serial Number: C120826

Re: Hernault Somua mill with Acorn and DMM servos

Post by yellow_submarin »

A quick update on this one.

I was having repeatability problems, losing a couple of microns on each back-and-forth move. After trying a couple of things, I concluded this was probably electrical noise causing lost steps between the acorn and the DMM drivers. Lots of AC power in that cabinet.

I changed the wiring to go through CNC4PC rj45 adapters for the Acorn and the DYN2. Not as easy as I thought because the rj45 wires are very stiff. But it did solve my problem !

I finally found a cheap Haimer 3d taster and got some more BT40 tool holders from shop-apt.co.uk (highly recommended !). So i'll be in the making of a BT40 power drawbar very soon, and most likely a partial enclosure and air mister. Then the mill will be fully operational.



Thanks
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