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hobbymat not cutting Parallel

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DiogenesII09/01/2020 20:53:27
59 forum posts
6 photos

Unplug the machine and remove the collar, pulley, gear, and key.

Loosen the rear locking ring and snug the front ring up until play is eliminated at the front bearing - the bearings should not be under load and the spindle should rotate smoothly.

A bar in the spindle/chuck to act as a lever will enable you to check more easily for sideways movement.

Having achieved this, hold the front ring still with the spanner and tighten the rear ring to lock it - it may take a few goes to get it feeling just right - patience is the key!

Replace the key, gear, pulley etc. and test run the machine - it should run smoothly and freely at 2000 rpm, and without getting hot at the bearings (warm after prolonged running is okay).

If it feels stiff, "notchy," or labouring to reach maximum speed, you will have to go back, loosen the rings, and release the bearing load by tapping the back of the spindle towards the tailstock with something soft, such as a piece of wood. Repeat adjustment until satisfied - it sounds laborious, but doesn't take long and is worth doing carefully because the improvement in the feel of the cutting action and the finish on the work are marked on this small machine.

The photo's provided by Nick include the section regarding adjustment of the spindle bearings, such as they are..

jamie creighton10/01/2020 17:27:59
10 forum posts

many thanks, basically what i was going to do but thought it best to check from those that have done it.

Howard Lewis11/01/2020 16:26:28
2895 forum posts
2 photos

The method advised by Ketan applies to the mini lathe (Sieg) so may not apply to other makes.

If you want to know what I did, PM me an with an E mail address, and I'll forward it to you.

BUT bear in mind that this is for another make of machine, and so might overload, or be insufficient for another marque.

Howard

jamie creighton20/01/2020 18:22:49
10 forum posts

just an update,

i ran through setting it up again and still no joy.

i then bought new spindle bearings and have just put them in.i will check it all again at the weekend as i also now have a 30mm bit of steel to use as a check for true cutting but on starting it up and letting it run im amazed at how silent it it now is. fingers crossed

jamie creighton26/01/2020 16:56:29
10 forum posts

well just to follow this up,its now sorted and cutting true!

what it was was silly,i'd been all day cutting test bars and running a dial gauge up and down all to no avail.

this morning id made my mind up to sell it,i thought id have one last go and then i suddenly thought that if the d-shaped bar that the carridge runs on was bent slightly away from me at the tailstock end that might cause the problem.

i pulled it towards me and sure enough after a skim cut the taper was at the chuck end,im on to something i thought.

i put some masking tape across the bar/backplate and put 3 lines across the joint,i then cut the masking tape in half so the lines become reference points as to how much i move the bar towards me . after 5 mins it was cutting true!

im chuffed to bits as i had all but given up on this little lathe.

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