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Re: Centering tailstock?

 

The Unimat 4 is essentially the same as the 3 but with a better motor that will manage continuous running. I have not seen any other differences.

I have used dead-centres to find that the alignment was off. Eccentricity... Well, I think I have looked for that by turning the headstock while?checking... As I could see, it did not affect the alignment when I turned the headstock spindle.

I started with a drill chuck?holding the centre drill, it had sort of "milling" action and did not produce a hole with a sharp point in the bottom but instead a "flat" I concluded that the centre was off and set up with a collet in the tailstock, same result and that made me think that the tailstock is off-centre.

I'll check the way it is fastened to the base plate, it may be an issue! The base plate I have is a "weak" piece of particle board but I have some pieces of 30 mm kitchen top bench material that might be better. Will also find a long enough steel ruler and check that the bed is straight.?

I bought this one second had and had it stored for a long time, now I started using it and found this as the first and main issue to manage, hope it's the only one beside making new belts...

Thanks!

Anders

Den s?n 3 nov. 2024 kl 07:43 skrev Peter Brooks via Groups.Io <peter=[email protected]>:

I¡¯ve not come across the Unimat 4 before but it looks very much like a red U3!
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Two dead centres, one in each of the holes in the headstock and tailstock spindles would check whether these shafts are aligned at the point of exit¡­
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What was holding your centre drill? Presumably a drill chuck or collet. Have you checked that for eccentricity?

Is the bed bent or twisted - or being twisted by being fastened down to a base board? (I use some birch ply under each end of the bed to avoid the middle support grounding on the wooden baseboard and potentially bending the bed).
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Just some ideas to check¡­ I can¡¯t imagine how you would true up the tailstock casting. Would a U3 one fit? I have no idea. The bed looks to have the same profile from photos.
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