Author Topic: Schaublin 125-CNC retrofit to LinuxCNC and Mesa cards. (Read 34445 times)

RotarySMP · « **on:** February 28, 2021, 08:17:25 AM »

I couldn't resist when this came up for auction..

There is not much online about such old CNC electronics, so I decided to a video as a tribute to the electronics and computor engineers of the 1970's. While it would be cool to get it going as is, without any manuals or knowledge of the schaublin interface with the Data General Nova, that is not feasible. I will remove the controller as a complete module and send it to a museum or collector. It wont get scrapped.

Muzzerboy · « **Reply #1 on:** February 28, 2021, 12:01:20 PM »

Fascinating stuff! Yours was machine #12 in 1981 judging by the label. The date codes on those ICs slightly predate that, which makes sense.

Jealous as hell, will be watching!

RotarySMP · « **Reply #2 on:** February 28, 2021, 02:53:32 PM »

Oh yeah, thanks for pointing that out. knew there was a reason why I suspected it ws from 81, but lost track of why I thought that.
Mark

RotarySMP · « **Reply #3 on:** March 07, 2021, 06:01:34 AM »

Well, no turning bck now...

Mark

RotarySMP · « **Reply #4 on:** March 14, 2021, 07:00:57 AM »

Whatever cutting oil was used in this machine dried up like varnish. I am having to tear it down further than planned to clean this out, as the slides are stuck down.

Mark

philf · « **Reply #5 on:** March 14, 2021, 05:39:01 PM »

Did you find out how the belts were tensioned?

Loving the videos.

RotarySMP · « **Reply #6 on:** March 15, 2021, 07:59:51 AM »

There is nothing, so the belt tension is what it is. I also find that weird. There are no taper pins, so a tiny bit of slop in the screw holes can be used.
Mark

RotarySMP · « **Reply #7 on:** March 21, 2021, 09:00:48 AM »

I pulled the Saddle off this week...

Mark

RotarySMP · « **Reply #8 on:** March 28, 2021, 07:28:21 AM »

Made a little more progress, but also a bit of a set back:

RotarySMP · « **Reply #9 on:** April 04, 2021, 06:02:25 AM »

I procrastinated as long as possible, but it is time to play workshop tetris.

RotarySMP · « **Reply #10 on:** April 11, 2021, 06:04:02 AM »

Pete. · « **Reply #11 on:** April 11, 2021, 09:03:58 AM »

Looks like there's very little grease in those bearings, but then again most people tend to over-grease them. When I put new spindle bearings into my Hardinge lathe I looked up the manufacturer's spec for the amount of grease to use and I was surprised at the small amount required - 4.6cc

RotarySMP · « **Reply #12 on:** April 11, 2021, 09:49:10 AM »

Thanks for that. I knew it was only a small amout, like 15 or 25%, butit is nice to see the table with the amount in g. I'll use that.
Mark

philf · « **Reply #13 on:** April 11, 2021, 05:30:33 PM »

I assume you haven't got access to the inner race of the front bearing behind the labyrinth seal. To remove front bearing would mean putting pressure on the outer race to drive off the inner race which isn't recommended bearing practice. If the bearing is very tight on the spindle you might exceed the axial loading limit and damage the bearing. If the bearings feel very smooth I'd go for injecting a small amount of grease.

Having said that the lower bearings on my mill are much smaller a/c bearings and a stuck 2 morse taper attachment takes a sharp knock on the end of the drawbar to release and 30 years of sharp knocks doesn't seem to have done the bearings much harm. (And they've never been regreased.)

RotarySMP · « **Reply #14 on:** April 11, 2021, 05:41:21 PM »

Yeah, the only way to put force on the inner race of the front pair is through the labrynth seal, which is cast iron. I have nightmares of it going Ping, as it must hae plent of non-radiused corners.

If the belt hadn't failed, I probably would have taken my chances with the 40 year old grease. Kluber is very good quality grease.
Mark

BillTodd · « **Reply #15 on:** April 12, 2021, 05:01:57 AM »

I would not take that spindle apart !

I have replaced lathe spindle bearings on simpler lathe spindles - as you say - major pucker factor - even simple lathes have very expensive bearings !

I'd either lubricate in place or leave be.

The bearings and grease on my HLV-H are now 55 years old and still OK, I have the urge to pull them and lubricate too.

mattinker · « **Reply #16 on:** April 12, 2021, 07:42:10 AM »

Mark,

I definitely wouldn't take it apart, a long soak in solvent, I'd then try to "flush" it with diesel with your syringe before re-rinsing in solvent blow dry and grease!

"If it aint broke" ............................

Cheers, Matthew

RotarySMP · « **Reply #17 on:** April 25, 2021, 06:23:40 AM »

Thanks. Yep, that is what I did...

mattinker · « **Reply #18 on:** April 25, 2021, 09:36:49 AM »

So i saw!

Gave you a like!!

If by chance you find yourself in Paris, (Le Bourget air show?) look me up!

Cheers, Matthew

RotarySMP · « **Reply #19 on:** April 25, 2021, 10:18:54 AM »

Thanks. I went to the Paris air show once. Must have been about 1999 or so. Very cool.
Mark

BillTodd · « **Reply #20 on:** April 25, 2021, 02:51:28 PM »

Tip for pulling reluctant dowlpins , use an er collet chuck to grab the pin and threaded rod as a diy slide hammer.

awemawson · « **Reply #21 on:** April 25, 2021, 03:29:38 PM »

And when you replace them always put one in with a female extractor thread - dead easy to do, and the next bloke to come along will thank you !

(Had that issue with the powered tooling gear boxes on my CNC lathe, making a female threaded dowel was the work of minutes on the lathe.)

RotarySMP · « **Reply #22 on:** April 26, 2021, 01:00:40 AM »

Good points. I'll check if these are hardened, and if not I could drill and tap the end.

RotarySMP · « **Reply #23 on:** June 20, 2021, 06:35:35 AM »

RotarySMP · « **Reply #24 on:** August 15, 2021, 02:39:52 PM »

Little more progress...

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Author Topic: Schaublin 125-CNC retrofit to LinuxCNC and Mesa cards. (Read 34445 times)