Retrofitting a 1986 Maho MH400E

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23 Jan 2020 02:22 #155488 by Mccartymachine1
I still have not figured out a way to get a digital read out on the screen showing the position of the rotary table. Mine also has the rod271 encoder. My machine is a mh600c and I am running a 7i77, 5i25, and the original servo drives. I got some documentation on the rod271 but the wire colors do not match what maho used. Don't want to connect wrong and fry encoder. Need help with wiring and ini please.

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23 Jan 2020 05:37 #155506 by J Green
Hi Mccartymachine1
Am sorry I can't answer your question.
My thoughts are it would help others , who may have a answer, if you could post your ini. file an the ROD 271 doc. I think the ROD 271 has TTL output so should be able to wire directly to your 7i77. Meaning that it doesen't require a Exe-Bd as your Heindehain scales do. Your documentation will note what the TTL voltage level is. Might be useful to get a Photo of the dissembled connector showing the pins an pin wiring. Darn pastel colours an OEM parts can be a bother.
Also I guess you may want use of the index - reference mark and how to off set it for homing. Especially if the rotary table is servo controlled.
What are you doing to cause the table hydraulic brakes to release? If the rotary table is servo controlled then might be worthwhile to also include your HAL file . What user interface are you using ?
What the heck throw in a photo of the rotary table too ! Please
Stay warm
Bob

P.S. Forgot to mention -include a MAHO schematic section showing the Rod wiring. Don't think they used the differential TTL signal , that to me is just asking for trouble. Could have been due to how Philips control boards were designed.

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23 Jan 2020 07:35 #155513 by RotarySMP

drimaropoylos wrote: It is a MH600E, the new ball screw is from a MH400E x axis. Exactly the same dimensions for y axis of MH600E
John


That is useful to know. Thanks.
Mark

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23 Jan 2020 08:58 #155517 by hanmon
It seems to be I have different manuals,
so I took some pictures of the related pages.

ROD-Encoder wiring, see page 7:

This browser does not support PDFs. Please download the PDF to view it: Download PDF


in german:


B-Axis and universal table:




Adjusting BT-40 tool clamp:



Adjusting the wedges:
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The following user(s) said Thank You: drimaropoylos, Azzrael

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23 Jan 2020 10:19 #155522 by hanmon
First of all no more jokes about my balls ;-)

37 per line is the correct number which gives a gap of 1.5mm.
The whole operation takes approximately 10-15 minutes and does not need any lubrication or auxiliaries.

- Count 37 balls in a jar and pour them into the nut having turned to a point where they can fall into the correct turn.
- Find the sweet spot where they just fit into the deflector.
- Use a non-magnetic needle, wire or screw-driver and push them all in.
- Turn the nut to the next pitch and continue

In my opinion it is perfect now with the P10 balls with diameter 3.51mm.
I can now still turn it with two fingers and sense a little pre-load, a little.
I think that someone has fiddled around before and filled in too few balls which lead to a jam that cracked one or more balls at the hardened deflectors.
The 240 balls before weren't enough, I'm sure. Now I have 259 in total.
(You can never have enough balls, lol)




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23 Jan 2020 10:57 #155529 by RotarySMP
If we are no longer allowed to discuss your balls, it looks like you're screwed!
Mark
The following user(s) said Thank You: tommylight

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23 Jan 2020 12:33 #155538 by Mccartymachine1
It is a manual table. The hydraulic release for table and tool have been changed to manual pump (originally designed for duel acting cylinder to lift a truck cab). Scales where Philips and I changed for Chinese 1um Sino brand scales. Working great. Have not even started ini or Hal for table encoder. I am not good with that stuff. Most of my Hal and ini where cut and paste from examples.
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23 Jan 2020 12:54 #155541 by Mccartymachine1
Looks like brown is +5v, white is 0v. What are Ua0, Ua1, and Ua2? I'm assuming ref, A, and B.
I don't mind not using a reference. Want to be able to manually home table to 0 degrees and have DRO function separate from cnc functions.
Machine is running on 240v single phase. 100A breaker.
I'm in Pennsylvania, so yes it's cold but garage is heated : )

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23 Jan 2020 13:23 #155543 by RotarySMP

Mccartymachine1 wrote: Looks like brown is +5v, white is 0v. What are Ua0, Ua1, and Ua2? I'm assuming ref, A, and B.
I don't mind not using a reference. Want to be able to manually home table to 0 degrees and have DRO function separate from cnc functions.


On Heidenhain linear scales, Ua 0 is the reference, so that is probably consistant across evrything they do.If you have the ref signal you may as well input it to LinuxCNC. If you input that to LinuxCNC, you could probably quite easily have a workflow to manually zero that axis with a lot less hassle than setting up a DTI, and probably more accurate and repeatably.

What is the benefit of having a C axis on a CNC? I can see the benefit of a B axis, and even more so stacked A and B, A and C or B and C, but a C axis alone doesn't seem to bring much to the party that you can't do with interpolation. I guess the MAHO's do have the head rotation as a manual B axis, so if the job needs it, and you have the patience, with a C axis you can do pretty much any 5 axis indexing job.
Mark

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23 Jan 2020 14:26 - 23 Jan 2020 14:35 #155545 by drimaropoylos
When you start the machine you must home all the axis, including the table c axis. Using the index you can align the table t-slots compared with the rest of the machine very accurately, and not have to use the indicator on every startup.
On e VMC the c axis (alone) is not that useful, but on a machine with tilting head and horizontal spindle a rotary table is very useful.
John
Last edit: 23 Jan 2020 14:35 by drimaropoylos.

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