Suggestions for lathe-only projects?

[Michael GilliganParticipant @michaelgilligan61133]

Posted by roy entwistle on 03/12/2020 21:35:49:

MichaelG You knew what I meant and surely it should be obvious

Roy

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Of course I did, Roy … but you were being a Smart Alec when William was asking a reasonable question, so I thought you deserved a taste of your own medicine.

MichaelG.

[JasonBModerator @jasonb]

Maybe some more useful advice would help.

Within reason size does not matter, just keep the two pins pushed against the rear of the slot you have it in.

Your method of holding a faceplate in the 3-jaw to set it true does not sound ideal. You would be better removing the chuck and fitting the faceplate for basic setting. However if it were me I would push the pegs back against the tee slot and nip up the nut then put a DTI against the face of the slide and run the cross slide in and out and gently tap the slide until there is no movement on the needle then tighten the nut fully.

I'm not a myford man but from some other posts on here I see that the single bolt type may have a hollow nut that secures the body to the base and then the tee bolt passes through that to secure the slide to the table. Can I suggest you remove the nut and large tapered washer to see if there is a second nut below. If so this would be used to lock the base and body true across the lathe and only need touching if you wanted to alter the angle, the rest of the time it won't swivel when the stud nut is undone.

[Mick B1Participant @mickb1]

Posted by JasonB on 04/12/2020 07:11:20:

…

…However if it were me I would push the pegs back against the tee slot and nip up the nut then put a DTI against the face of the slide and run the cross slide in and out and gently tap the slide until there is no movement on the needle then tighten the nut fully.

…

If I'm reading you right, I think it's easier to run the saddle up to the chuck with the fasteners loose, so that the vertical slide face – or vice if one is mounted – touches the chuck jaw faces, which should be pretty truly square to the spindle axis. Then carefully tighten the the vertical slide in position on the crossslide. I do this every time I mount the vertical, and I'm generally parallel to crossslide travel within a thou or two over the width of the vice. But I may be misunderstanding the requirement.

[JasonBModerator @jasonb]

Yes should be OK for a lot of things though William seems to be getting 5thou runout. As I said a few days ago I would be looking for more like 1/2thou over the width of the slide so would use the DTI on that much the same as I would setting a vice, angle plate or work directly to the mill table

[William AyerstParticipant @williamayerst55662]

Hello gents,

Just an update – I got an RDG fixed vertical slide and butted it up against a faceplate (threaded on the spindle, not the jaws) for a rough estimate and then trammed the (?) it in with a DTI across the face and surface of the jaws for horizontal and vertical alignment. I guess I should probably have a known-square parallel or something for this job? Also, my DTI is terrible, any recommendations?

Anyway, with that, I managed to get about 2.5 thou across the width of the vice jaws – but I am basically just learning everything simultaneously so I'm fairly happy with that for now.

I will do the same with the double-swivel slide (that is, using a DTI and faceplate) to validate, but I think this thread is starting to drift quite a distance from where we started!

Thank you all!

[Michael GilliganParticipant @michaelgilligan61133]

Posted by William Ayerst on 04/12/2020 17:40:28:

[…]

I will do the same with the double-swivel slide (that is, using a DTI and faceplate) to validate, but I think this thread is starting to drift quite a distance from where we started!

Thank you all!

 

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O.K. __ Back to your opening question:

I suggest making a Gyroscope

MichaelG.

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http://www.gyroscopes.org/

Edited By Michael Gilligan on 04/12/2020 17:47:31

Edited By Michael Gilligan on 04/12/2020 17:56:33

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