Retrofitting a 1986 Maho MH400E

J Green wrote: Glemigobles
My MH600E has table droop - sag . Was wondering where your machine is worn?
Have you considered inviting Mark over for a Three week MAHO scraping party ? :laugh: :laugh:

Thanks for the kind offer. I am unfortunately busy in those weeks.

I have been doing about an hour scraping per day. Hard work, can't imagine what it was like for this as a career.
Mark

Hi All,

I have been back to Chris's Maho C 700 today and have removed all the control cables from the TNC, when I powered up the machine there was no message on the display. I have checked all the IC Chipset and EProms they are all soundly in position.

Hi Brad,

What exactly has been Done At the Service in Germany .
Did You Take a Look in the service manual ?
Heidenheim.com - Service - omu controls - TNc135

Hello db 1981
To answer your last note.
I have a good friend in Germany who has a similar Maho. His machine has gone for years with no bother. He talked to his service technician and then wrote to me. I quote from his letter. " The eproms are in the Tnc, which has to be opened, six of them. The eprom that you did mention is not part of the tnc. The fault can be in one of the eproms but also one level deeper in one of the rems.
His suggestion: you get from him a reconditioned platine which includes the six eproms and the rems as well. Price would be about Euros 180.- plus freight. You will surely find somebody who can change the platines.
And that is (I presume) what was done in Germany. The machine worked again with D.R.O. but there was no TNC.
My friend wrote again in no uncertain terms. Again I quote "Yes, I do suggest getting a new/rebuilt TNC from Germany, if you had done this in the first place instead of fiddling around over months, you would be working with your mill already. I am not sure if any modifications done by a local electrician are to be trusted as well. Please excuse my harsh words, but I think the TNC is basically a very good system and I -except a failing power source- did never have any problem. Again: what are the exact symptoms of failure and what does the monitor say?" end of quote.
So I have been under pressure. Living on an Island (New Zealand) half way round the world from Europe has its advantages but Traveling and freight charges are very expensive. The NZ dollar exchange rate relative to the Euro further adds to the cost.
I understand Eproms are not made any more.Their life expectancy 20 years? If that is a fact. Any available are going to be from old stock or from a wrecked machine.
After what I have read and despite what my friend wrote. I do not trust the 35 year old Heidenhain TNC. Again if I was in Germany I would likely have it repaired. Please, there has to be an alternative and that is why I am on this Forum. Yes, Brad has the service manual.
Thanks db1981

Hello db 1981
Yes that works. Can't believe I never tried that button. So obvious! Shows how little use I have had out of this Maho.
Thank you again.

Hello db 1981
You wrote I quote " To have DRO you can add an DRO Display which can handle 11uA linear Scales (Heidenhain)."
Can you tell me more. I need a D.R.O so I can carry out basic straight line milling. I do intend to retrofit to CNC (If I can justify the expense) and when we decide what to do.
Thanks Chris