Retrofitting a 1986 Maho MH400E

27 Mar 2018 01:07 #107937 by J Green
Yaa ! you're back . That control housing is looking as if it is a stock Maho made part.
If Reseda Green is the main color on your machine---- what is the name of the other color used as trim ?
Looks like you have the spindle drive motor out. Hope you are still going for LinuxCNC to do the gear changeing .
Glad to see more progress.
27 Mar 2018 09:33 #107950 by andypugh
I thought that Reseda green was just for test and calibration machines, not production machines.
(Thought that might have been just the standard of one business we used to supply test gear to)
27 Mar 2018 12:41 - 27 Mar 2018 12:42 #107953 by RotarySMP
On my machine, the spindle motor and it's control relays are all standard. I am going to use the MAHO gearbox for speed control. It is John who is modifying his with an encoder and VFD, but he is also going to keep the gearbox active for the torque.

Good question what that darker forest green is which MAHO used. I am not a huge fan of Reseda green, but my MH400E is in such good mechanical condition, there is no reason to think about a repaint.

In Germany it seems like there must have been a legal mandate to paint all machine tools green in the 60-70's, as it is the most common color. Earlier machines were often grey or powder blue, while in the 80's they started painting machine tools to match there ski outfits.

Last edit: 27 Mar 2018 12:42 by RotarySMP.
27 Mar 2018 12:55 #107955 by cgroth
Hi Mark, not a legal mandate, but the industrial standard DIN 1844. It has been withdrawn.
01 Apr 2018 12:51 #108209 by J Green
There are some useful photos of a Heidenhan LS403 scale read head just entered by "/Kammlake" at Pract Mach website-"fix your MAHO" section..
Mark , if you can figure out how to drag your neat information on cleaning the scale and the PDF over there (I gave up trying ) - it might help to get another MAHO up and going.
Think Spring and warm basements
12 Apr 2018 08:03 - 12 Apr 2018 08:08 #108870 by RotarySMP
Got a little more done yesterday. Just scratched my head wondering where I left off, then rivetted the button mount screw plates onto the face plate, and mounted the USB extensions.

Last edit: 12 Apr 2018 08:08 by RotarySMP.
12 Apr 2018 13:57 #108876 by J Green
Glad to see you are making more progress.
Was comparing the front panel photo of Jan 3 to this photo and wondering if the front to back have been switched. Or is this photo showing a before the riveting is done layout?
Hope to include a PDF showing some miniature 5 volt light bulbs that might be useful to repair a LS 403 scale. Seems interesting the range of expected life span for the bulbs.
Would be useful to know what the LS 403 photo sensors spectrum sensitivity is, especially if trying to convert from incandescent to LED .
Any way glad to see you are making headway !
confused Bob
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12 Apr 2018 14:08 - 12 Apr 2018 14:09 #108877 by RotarySMP
Hi Bob,

The photo above is the back side of the front plate. I didn't want a bunch of extra threaded fasteners through it to mount the button carriers, so I had plates lasered which got riveted. I'll update the photo to make it clearer.

My LS403's require both 5V and 12V DC supplies. Not sure which supply is for the bulb, and which powers the sensing head. Thanks for the file on the bulbs.
Last edit: 12 Apr 2018 14:09 by RotarySMP.
23 Apr 2018 23:25 #109515 by J Green
Was hoping to see/hear more results of the retrofit.. Has warm weather been postponed in your area too ?
Poked around a Heidenhain Exe board with a Ohm meter from 12 volt Bd. test point to the scale input connector. Did not find conduction to any of the scale input board pins for 12 volt. Did see zero ohm from 5 volt Bd. test point to scale input connector.
Do remember using a infra-red TV remote pointed at a scales sensors to get it's readout to indicate some action.
Anyway, from the cheering section --- Go Little MAHO Go
25 Apr 2018 06:54 - 25 Apr 2018 07:05 #109580 by RotarySMP
Hi Bob,

Thanks for the information on the EXE board. That is very helpful for when I finally dig into that vertical LS-403.

Spring is busier than I remember. Garden grows like crazy, we seem to have a wedding or party event every weekend, and I am struggling with the course I decided to do this semester. I am pretty good a procrastinating, but don't give up projects, they just have pauses in them. Thanks for the motivational reminder.
Last edit: 25 Apr 2018 07:05 by RotarySMP.
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