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Play in RA shaft of a Losmandy GM8


Jun 17, 2001

 


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#4603 Jun 17, 2001

Have recently stripped my GM8, replaced worm bearings. On re-assembly

having regreased with "Alvania #2", find the RA shaft has a real play

of 5 thou", that is 0.0025" about a centre. This is NOT in the worm to

pinion mesh, but real "slop" between the RA shaft and the RA bearings.

Whilst this is not a major disaster (the RA shaft has a run out

error totalling 0.00025" as measured on Vee blocks at bearings positions,

so it is not a bent shaft - loads have never been over ratings anyway),

it is felt that this error is a bit much.

HELP ?? :



1. Does any one have a drawing of the innards of the Dec/RA shaft housings ?



2. How can RA/Dec bearings end caps be got off ? -what holds them on ?



Have the Queensland State Engineering Standards Laboratory advising

me and they feel that the bearing covers may be "Loktite" held and that heat

may get them off ? Further that the "Play" may be attributed to incorrect

adjustment of the RA bearings before putting on the end caps.

As the unit is in pristine condition we are loath to attack it without

proper prior knowledge - we have none, any heap genbuinely greatly

appreciated.

Hope Scott sees this one, Gerald.



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