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Posted by Russell on January 27, 2008, 3:49 pm
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Tim Leech wrote:
>
> >mark@ems-fife.co.uk wrote:
> >
> >> > Hi All
> >> >
> >> > I've just bought a secondhand Meddings Drilltru pillar drill which
> >> > looked OK and and has no detectable slop at the chuck.
> >> >
> >> > When I got it home on the floor I tried it on all the speeds and
> >> > discovered a problem. On the highest speed I needed to put my foot on
> >> > the base plate to keep it still and it was quite noisy.
> >> >
> >> > On closer inspection I found that the quill pulley has been sleeved, and
> >> > there appeared to be some runout. On dismantling I discovered that the
> >> > shaft appears scored as though the pulley has been spinning (even though
> >> > it is keyed).
> >> >
> >> > Can anyone suggest a way to refit the pulley and be sure it'll run true.
> >> > I'd be grateful for any suggestions.
> >> >
> >> > Russell
> >>
> >> Mount the pulley on a mandril and recut the grooves true or press the
> >> sleeve out and rebore the pulley true and fit new sleeve.
> >
> >The problem is that the shaft is a mess. I've been thinking about
> >skimming the shaft but there's not a lot of meat on it as it's tubular
> >and it doesn't look as though there'd be much keyway left. I've been
> >wondering about building up the surface of the shaft but welding or
> >brazing seem likely to cause distortion of the splines on the inside.
> >
> >Russell
>
> Does the pulley need to slide on the shaft?
> If not, then maybe Loctite retainer will do the job, one of the
> gap-filling varieties. If the pulley is really sloppy, you'll need to
> find a way to secure it square to the shaft while the Loctite goes
> off.
> Metal spray or chroming the shaft might be another way, but might cost
> more than the machine is worth by the time it's been ground back to
> size?
>
> Tim
Thanks for the suggestions and in particular Tim's which got me thinking
on the right lines. There's a picture here of the drill running at max
speed (about 4000rpm) which shows success. It's not fastened down.
http://www.hockerley.plus.com/drill.jpg
Russell
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