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Posted by David on May 21, 2008, 3:27 am
Please log in for more thread options I was thinking of putting mine (after getting a new bearing for it, but my
center is a big and chunky one) in the headstock of the lathe, move my
compound slide to 30degrees, and use a toolpost grinder (like I just did
with my chuck jaws).
Anything wrong with this? Is it a problem if the center free revolves
(whilst also revolving when the lathe is switched on)?
--
Best regards,
Dave Colliver.
http://www.AshfieldFOCUS.com
~~
http://www.FOCUSPortals.com - Local franchises available
>
>> I was looking out for a decent new MT2 live centre at Harrogate,
> there
>> wasn't much about. Chesters had two qualities, the better one looked
>> quite good but I was discouraged from giving them my money by the
>> surly staff response to my enquiries.
>> I came away instead with a job lot of three used ones from a well
>> known dealer, he went through all his pile & we agreed most weren't
> up
>> to much but these three looked good except that they needed
>> regrinding.
>> I was going to take two but he ended up offering me the three for a
>> fiver each.
>> Anyway, today I set about regrinding the points.
>> I've got the benefit of a proper T&C grinder, but the same could be
>> done on any grinder with some sort of XY table. I set one up in the
>> universal head at the right angle and hoped they would rotate with
> the
>> friction from the grinding wheel. Unfortunately this only worked
> with
>> a heavy feed, ok for a roughing pass but no good for finishing.
>> After a bit of contemplation I glued up a bit of 4mm O-ring cord
> into
>> a belt of about 400mm length. Then found that one of my cordless
>> drills has a bit of a notch on the keyless chuck which is just deep
>> enough to act as a sort of pulley to keep the O-ring belt in
> position,
>> provided it's kept somewhere near into line. It wouldn't be much of
> a
>> job to turn up a crude pulley if the chuck wasn't so considerately
>> designed. Then looping the belt over the nose of the live centre,
> and
>> holding the cordless drill in such a position that the chuck
> 'pulley'
>> kept the belt pressed against the static body of the centre, I was
>> able to spin the centre point at a suitable sort of speed. I then
> had
>> just enough hands to hold the cordless drill while pulling the
> trigger
>> and work the table feeds on the grinder, job done in 5 minutes after
>> the preparatory work. Yes the belt does have a few notches ground in
>> in where it slipped off as my concentration wandered from one part
> of
>> the excercise to another, but it is still intact after regrinding
> all
>> three.
>> I didn't have any spare hands to take a picture, though!
>>
>> Of course, if doing the job regularly a proper fixture would be
> worth
>> making, but for a once-in-a-blue-moon job like this it would be a
>> waste of time.
>>
>> Tim
>>
>
> J&S 1300 cylindrical grinder with 3MT female in the live work head,
> swivle work head to require angle and grind to perfection. I'd do it
> for you but mine's still in storage!!!!
>
> Andrew
>
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>wasn't much about. Chesters had two qualities, the better one looked
>quite good but I was discouraged from giving them my money by the
>surly staff response to my enquiries.
>I came away instead with a job lot of three used ones from a well
>known dealer, he went through all his pile & we agreed most weren't up
>to much but these three looked good except that they needed
>regrinding.
>I was going to take two but he ended up offering me the three for a
>fiver each.
>Anyway, today I set about regrinding the points.
>I've got the benefit of a proper T&C grinder, but the same could be
>done on any grinder with some sort of XY table. I set one up in the
>universal head at the right angle and hoped they would rotate with the
>friction from the grinding wheel. Unfortunately this only worked with
>a heavy feed, ok for a roughing pass but no good for finishing.
>After a bit of contemplation I glued up a bit of 4mm O-ring cord into
>a belt of about 400mm length. Then found that one of my cordless
>drills has a bit of a notch on the keyless chuck which is just deep
>enough to act as a sort of pulley to keep the O-ring belt in position,
>provided it's kept somewhere near into line. It wouldn't be much of a
>job to turn up a crude pulley if the chuck wasn't so considerately
>designed. Then looping the belt over the nose of the live centre, and
>holding the cordless drill in such a position that the chuck 'pulley'
>kept the belt pressed against the static body of the centre, I was
>able to spin the centre point at a suitable sort of speed. I then had
>just enough hands to hold the cordless drill while pulling the trigger
>and work the table feeds on the grinder, job done in 5 minutes after
>the preparatory work. Yes the belt does have a few notches ground in
>in where it slipped off as my concentration wandered from one part of
>the excercise to another, but it is still intact after regrinding all
>three.
>I didn't have any spare hands to take a picture, though!
>
>Of course, if doing the job regularly a proper fixture would be worth
>making, but for a once-in-a-blue-moon job like this it would be a
>waste of time.
>
>Tim