Retrofitting a 1986 Maho MH400E

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22 Jan 2020 20:22 #155449 by hanmon
Hi,

even if it was under Water it may be still intact.
Mine had a film of coolant inside, everywhere.
I washed it with brake cleaner and it's perfect again.

Cheers
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22 Jan 2020 20:54 #155450 by drimaropoylos

Hi there,

counted my balls today ;-)
240, exactly. As the ballscrew nut has 7 ball returns I expected the Number to be a multiple of 7 minus one or two cracked balls. I don't know how to interpret that result.

Cheers


My old y axis ball screw with only 3 rows of balls left on it. I can measure 37 balls on every row.
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22 Jan 2020 21:00 #155452 by J Green
Hi hanmon
If you are referring to the ROD 27? - could you go into more detail about removing it from the rotary table? I have two rotary tables an the servo driven one looks as if the coolant turned the cog belt pulley into swiss cheese. Was trying to get the steel ball to release on the ROD to table shaft without success - just squirt it with super thin oil every time I walk pass it. Thanks for mentioning "Brake cleaner" as I forgot about that.

What is the latest about the ball screw adventure?
Bob

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22 Jan 2020 21:07 #155453 by J Green
Hi drimaropolos
What size is your MAHO ? For some reason I thought you machine is a MH500E.
Bob

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22 Jan 2020 21:13 #155454 by drimaropoylos
It is a MH600E, the new ball screw is from a MH400E x axis. Exactly the same dimensions for y axis of MH600E
John
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22 Jan 2020 21:20 #155457 by hanmon
I remember that I had to turn the table to a certain position where I could loosen the then lined-up allen-wrench screw through a hole in the mounting flange.

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22 Jan 2020 21:26 - 22 Jan 2020 21:36 #155459 by hanmon
Hi drimaropoylos,

thank you for that info.
I read somewhere that the gap on a line should be within the size of 1-5 balls.
Do you still have that ?
If I calculate your number for the seven lines, almost 20 balls are missing.
I will fill the nut an see how many balls it will take.

I adjusted the wedge on the X-axis.
Measured the original unmachined spacer to have 10,48mm.
Made a second test-spacer out of a tube and turned it down to 10,40mm and 10,32 which was enogh.
Turned the original spacer down to that 10,32mm then.
According to the manual a spacer reduction of 0,13mm minimizes the play about 0,001mm,
whatever that means and how they measure that.
Last edit: 22 Jan 2020 21:36 by hanmon.

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22 Jan 2020 21:44 #155463 by drimaropoylos
It may be true, I haven't open and see the new one. The deflectors in the old ball-screw are loose and more than one ball space may lead to jamming.

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22 Jan 2020 21:56 #155465 by drimaropoylos

Hi drimaropoylos,
I adjusted the wedge on the X-axis.
Measured the original unmachined spacer to have 10,48mm.
Made a second test-spacer out of a tube and turned it down to 10,40mm and 10,32 which was enogh.
Turned the original spacer down to that 10,32mm then.
According to the manual a spacer reduction of 0,13mm minimizes the play about 0,001mm,
whatever that means and how they measure that.

This is what you have adjusted?
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22 Jan 2020 23:26 #155476 by hanmon
yes.
The drawing looks different in my documents.
Will post a picture tomorrow.
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