Scale head

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Dirk - 04 Mar 2010 14:06 GMT

Hi,
Any chance in reviving a chinese scale, when:
battery ok,
it blinks very fast, readings at random,
sometimes steady for a while,
zero, mm/inch, on/off are ok.
Looks like it does not pick up the scale properly, although readings
change when it is slid over it.
Was connected with a dead battery to the Shumatech DRO switched on
until half way this winter. Still worked well when battery was swapped
at that time.
Best regards, Dirk

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Bob Minchin - 04 Mar 2010 15:02 GMT

> Hi,
> Any chance in reviving a chinese scale, when:
[quoted text clipped - 8 lines]
> time.
> Best regards, Dirk

Try contacting the guy who markets YADRO he has done a lot of work to
understand these scales.
Good Luck

Bob

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Alan Dawes - 04 Mar 2010 15:06 GMT

> Hi,
> Any chance in reviving a chinese scale, when:
[quoted text clipped - 4 lines]
> Looks like it does not pick up the scale properly, although readings
> change when it is slid over it.

Can you get to the sensor and clean off any grease / oil / swarf that is
clinging to it? This was a problem that the college I go to on Fridays
(most of us over 60!) had some time ago with some new mills and lathes
which caused the readings to be incorrect. I found out the hard way after
2 hours of machining relying on the DRO and ending up with a part that was
under size.

Alan

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alan.dawes@argonet.co.uk
alan.dawes@riscos.org
Using an Acorn RiscPC

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Dirk - 04 Mar 2010 15:29 GMT

Op 4-3-2010, heeft Alan Dawes verondersteld :

>> Hi,
>> Any chance in reviving a chinese scale, when:
[quoted text clipped - 13 lines]
>
> Alan

Thanks guys, yes, its insides are here bare on the table and clean as a
whistle. All looks good. The shiny black dot has a dull line in the
middle. I think it's partly dead ;-)
Dirk

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colin1544 - 04 Mar 2010 18:12 GMT

> Hi,
> Any chance in reviving a chinese scale, when:
[quoted text clipped - 8 lines]
> at that time.
> Best regards, Dirk

Hello Dirk Curious to the temperature in your workshop, I have just
fitted one and I've had similar problems, I've also had a problem
with a Allen DRO caliper and it is to cold for them. Get them warm and
they start to read Okay, Try getting a fan heater near one that is
missreading but not to close you only need to raise the temperature
slightly then retry. Cheers Colin.

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Dirk - 04 Mar 2010 18:56 GMT

Op 4-3-2010, heeft colin1544 verondersteld :

>> Hi,
>> Any chance in reviving a chinese scale, when:
[quoted text clipped - 15 lines]
> missreading but not to close you only need to raise the temperature
> slightly then retry. Cheers Colin.

Hi Colin,
Temperature in the shack has been near zero for months. This morning I
let warm up in the sun behind the glass. No effect.
Dirk

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Dirk - 27 Mar 2010 11:19 GMT

colin1544 heeft uiteengezet op 4-3-2010 :

>> Hi,
>> Any chance in reviving a chinese scale, when:
[quoted text clipped - 15 lines]
> missreading but not to close you only need to raise the temperature
> slightly then retry. Cheers Colin.

Hi Colin, it really must have something to do with temperature like you
stated. After a few days in the room it was ok. Then refitted it to the
mill and after about a week it went crazy again. Back in the room lit
by the sun, it was ok after a day... May be also moist or RH is
involved?
Dirk

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Richard Edwards - 04 Mar 2010 19:48 GMT

>Hi,
>Any chance in reviving a chinese scale, when:
[quoted text clipped - 8 lines]
>at that time.
>Best regards, Dirk

I had a problem with the Z scale on my mill at the weekend. Numbers
suddenly changed to something a lot different. (Feeds a Yadro)
Found that the slide was sloppy in the read head. Rubbed down the head
carrier to reduce the clearance and now perfect.
Bear in mind that a head from a 6" caliper will probably work.
Sometimes the screws are different maybe machine thread or self
tapping, sometimes 3 self tap and 1 machine thread. I have swapped
heads from cheap calipers with no problem.

Richard

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Dirk - 04 Mar 2010 21:07 GMT

Richard Edwards beweerde :

>> Hi,
>> Any chance in reviving a chinese scale, when:
[quoted text clipped - 19 lines]
>
> Richard

Thanks Richard. Doing exactly so at this moment ;-) Read some alarming
messages though some scales having different divisions. Anyway, found
an identical head. Don't think the broken one will come to live again.
Best regards, Dirk

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Model Forum / General / Models / March 2010

Scale head