Large bore lathes ?

[W.olly]

Looking for a lathe with a bore size minimum of 35mm.

What old school 3phase are of half decent make with a bore that size. Not long bed though. Shorter the better.
Going to use is to connect this to it for tu e welding

 

[zeppelin builder]

what you want is an old rigid screwing machine with foot pedal

 

[Kram]

You dont need a massive old lathe to make a welding positioner Bit of a waste.
Weld one up in steel plate, big bit of tube for the spindle with some big bearings and a flange to bolt a chuck on.

 

[dan.taylor.1]

I think most colchester lathes will be, my triumph certainly is but it is a big bore version

 

[Chippie]

You will be restricted by the bore of the chuck you fit to your back plate…my 8” chuck has a 2” bore, my lathe has a 38mm bore in the spindle…

 

[Rrobson]

Make sure you have a decent earth, precision bearings don’t like stray electrical charges floating about…
Can’t help but echo the above comments really, but of overkill / a waste of a lathe… big purpose built positioners can’t be that expensive?? Although I appreciate many dont have a hollow bore, can’t be difficult or expensive to manufacture something?

 

[Ton-up]

There was a lathe on a thread on here a week or so ago. Had a foreign sounding name and it had a 3 1/2" bore. I can't find it now!!

My mate had about ten years ago, what he called a 'facing lathe'. It had a short bed and no tailstock but had a huge bore, Unfortunately I cant remember anything else about that either other than it was blue!!!

 

[zeppelin builder]

thats small look up oilfied lathes

 

[W.olly]

Wwll it's all gone to cock with this plan.

Lathe would be used more than just welding. I have another plan to use a couple.of bevel gears and a motor we have so looks like that how it's going.

H&S does my head in.

 

[Screwdriver]

Colchester Student L0 spindle bore is 1.5" or 38mm. I think the ones with a camlock fitting are 40mm.

 

[knighty]

you don't need a lathe, just a moto, chuck, a couple of bearings, a bit of pipe and a backplate?

 

[W.olly]

you don't need a lathe, just a moto, chuck, a couple of bearings, a bit of pipe and a backplate?

its easier to make bushes with a lathe i reckon.

 

[knighty]

couple of decent pillow block bearings with grub screws to hold them in place?

maybe drill small a indent into the pipe for the grub screw to grip in if you're worried about axial movement (there shouldn't be much force on it that axis?)

sprocket on the pipe for a chain drive from a motor and gearbox combo to help slow it right down

35mm bore... even better if you can find a motor gearbox combo made to take a shaft, so you could put a keyway on the shaft (just weld it on, it's low torque) and slide the shaft right into the gearbox... means you can miss one bearing out... hell might be able to miss them both?


(typed that and realised it sounds a bit bossy.... didn't mean it like that, that's just how I'd do it)

something like this but larger bore? https://www.ebay.co.uk/itm/403875415503

 

[mr haynes]

Lang Junior 8.5" has a spindle bore of 41mm

 

[Dr.Al]

Harrison M250 has a bore size of 35 mm; M300 is 38 mm I think.