problem with pillar drill

I've just been looking at my similar m/c, don't really know what you mean. The square shaft has to slide up and down as the chuck is lowered, is it stuck ? Would suggest taking off the pulley block and see whats going on , maybe just needs clean and oil ? Maybe a bearing come loose, will prob. be able to loctite back in if so, but just guessing. Thought- the belt is on the same grooves ? Let us know.

Edited By Terry Blush on 24/08/2014 18:09:02

I understand the square rod drives the chuck is meant to slide up and down inside the pulley now, but why would the front pulley lift up? It lifts a good 40mm or so while the machine is running

The pulley should be held in place by a grub screw, I have a Clarke version of the same drill.

From memory it is in one of the pulley grooves. Tighten it up and all should be well.

John

Yeah, what John said. Its a 3mm hex head, in the 2nd groove down on mine.

Steve

Yep the grub screw is there and tight to the inner sleeve which is lined up to the flat spot. However that inner sleeve is what is sliding up

Crikey. That short shaft should not come out of the bearing.

Here is a picture of the assembly from underneath (the quill assembly has been removed). This picture is a shot of the underside of the top bearing.

The shaft may need to be modified and then pressed in again so it it a tight fit. It has to transfer a lot of torque. Some of the more knowledgeable chaps will provide solutions.

Steve

Hi Terry

Afraid I can't help with direct experience but I found a manual on the Grizzly Tools website which may give you some ideas **LINK** . On page 28 of the document 34 in the Adobe reader shows an exploded diagram. It seems to show some internal and external retaining clips.

Best of luck. Michael.

Hi Steve

Just guessing but I think the grub screw in the pulley transmit the torque into square tube then into the spindle. I think the pulley should be a press fit in the bearings, a bit of low strength loctite should hold it in place. Can't find the fingers crossed icon.

Cheers Michael.

Thanks Michael. That makes more sense than the conclusion I came to. It's worth trying the simple loctite solution first. I just had a walk round to the shops, and was thinking, there and back, about how easy it would be to make another shaft so that it was a tighter fit.

Steve

Oh joys lol I have some metal epoxy that I could use to stick it back in with. It's weird that it just started to vibrate loudly.

Thank you gents for your time and help.☺

The best thing to stick it together would be Bearing Grade Loctite(can't remember the number), with that the bearing can be removed with a normal bearing puller, it will also fill quite a big gap. I used it on the top bearing of my Vertical Milling machine's top bearing, after it spun in it's housing.

Ian S C

Do remember though its a ting tong special and ive had my fair share of far East precision and its merits of things not fitting.

Terry,

I agree completely with Ian's approach

641 is probably the most suitable grade.

MichaelG.

Cheers again, I'll have a look for some 641 and hopefully that'll do the trick.