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Posted by Cliff Coggin on March 27, 2008, 5:09 am
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>> RDG have restocked their Myford raising blocks so I bought a pair, but I
>> am
>> puzzled by their construction. At the top of the bolt holes is a smooth
>> bore
>> steel sleeve with a hexagon head set in rubber inserted in the block ,
>> however the thread lower down the hole is cut directly into the cast
>> iron.
>> If the rubber is meant to be a vibration damper why does the hold down
>> bolt
>> engage directly into the iron block? Perhaps I have misunderstood the
>> function, so I hope someone here can correct me.
>>
>> Cliff Coggin
>
> The rubber ring is to seal the block onto the swarf tray so that coolant
> does not leak!
> Do you have a swarf/coolant tray?
> The normal fitting is as follows:
> The swarf/coolant tray is bolted tot the bench/stand with studs or
> threaded rod leaving
> about 1 inch
> projecting above sleeve (which should be in approx mid adjustment
> position).
> The lathe is then lowered onto the studs followed by nuts and washers to
> secure the bed.
> The lathe should be initially leveled with an ordinary builders spirit
> level.
> If you have, or have access to, a precision level the bed can then be to
> eliminate any
> twist in the bed.
> If a precision level is not available then you will have to revert to
> turning tests to
> achieve parallel turning.
> Since you do not mention the studs I presume that they are not supplied.
> The Myford ones
> are only lonh
> enough for use with a Myford stand, if you mounting on a wooden bench you
> will need 4
> lengths of 5/16 BSF studding
> long enough:
> to pass through the bench + 1inch + the height of the blocks with the
> adjusters in mid
> position + the 1 inch mentioned above.
>
> You will also need 8 x 5/16 BSF full nuts, 8 ordinary 1/4 inch washers
> and 4 large
> washers ("penny washers", "maintenance washers"
> "mud guard washers").
> Please check the thread inside the adjusting sleeve! The Myford ones are
> definately 5/16
> BSF (I have just checked!)
>
> Hope this helps
> Regards Brian
Many thanks Brian, you have made sense of it for me. I do have a drip tray
under the lathe, but I don't have the lathe bolted down because I need to
move it occaisionally by sliding the lot across my bench top. Levelling the
lathe is something I have intended to do since I bought it six years ago,
but so far I haven't even tested its alignment, though I did once fit
centres to the headstock and tailstock and found that they met perfectly.
For the moment I shall fit the raising blocks between lathe and tray. Apart
from raising the lathe to a more comfortable height, I want to increase the
clearance between the raised edge of the tray and the back of my hand. The
studs incidentally were supplied with the blocks.
Regards, Cliff.
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> puzzled by their construction. At the top of the bolt holes is a smooth bore
> steel sleeve with a hexagon head set in rubber inserted in the block ,
> however the thread lower down the hole is cut directly into the cast iron.
> If the rubber is meant to be a vibration damper why does the hold down bolt
> engage directly into the iron block? Perhaps I have misunderstood the
> function, so I hope someone here can correct me.
>
> Cliff Coggin