Home Shop Machinist Magazine

**Michael G** · 11th February 2015, 06:51 AM

Originally Posted by ronboult

I have a slightly larger Sieg SC4 lathe that has 4" 3 & 4 jaw chucks as standard. They are never large enough, particularly the 4 jaw and they are a drag to change with the fixing nuts located between the spindle flange and the headstock.

I, like you, wish to fit 5" chucks but in my case FRONT MOUNT Chucks to somewhat overcome these limitations. My problem is how to machine 5" backplates on my lathe as these cannot be held in my current chucks to produce the back spindle locating recess. Any suggestions on how you are going to make your 5" backplate.

The normal way of doing it would be to mount the backplate blank onto the lathe and machine it in situ to mount the chuck (that is, not mount the blank in a chuck but directly on the spindle).

I could have this completely wrong, but from your description it sounds like you change chucks by unbolting from the backing plate? Not a very convenient way of doing things and prone to inaccuracy I would have thought. Would you be better off making up a new spindle? Even a screw on mount would make changing chucks easier.

Michael

**Toggy** · 11th February 2015, 07:29 AM

Michael,

The Taiwanese lathe here has a flange followed by a short taper on the end of the spindle. Backplate locates on the short taper then is fixed by 3 studs (think D-1 3/4 etc) through the flange A 'C' shaped washer slips over the stud, then the nut tightened up on the washer.

No big problem really. Does the job and does not unscrew or lock tight unlike some of the threaded spindle noses.

Ken

**oldboy** · 11th February 2015, 09:08 PM

Ron,
I made my backplate from steel obtained from a steel fabricator not far from me. It was cut from a 160mm steel bar the thinnest their equipment would cut was 20mm the cost was $22.00. Good luck and have fun.

Barry.

**wm460** · 13th February 2015, 08:11 PM

Originally Posted by KBs PensNmore

2 wood lathes, a Symtec 1500 and a mini wood lathe can't remember the name but it needs a new motor.

Hi Kryn What size motor are you looking for?
I have a few sitting in my shed that my suit.

**KBs PensNmore** · 13th February 2015, 10:28 PM

Hi Mark, the motor I'm looking for is similar to the Jet mini lathe variable speed motor, about 75 mm diameter and 100 mm long.
Can get one from Qld as a spare part, but it's the usual problem, SOF .

There always seem to be something more important, I sold a good lathe, and got this one as a free bee.

Reckons he couldn't get a motor for it.
kryn

**wm460** · 18th February 2015, 07:40 PM

Hi Kryn,

The motor I have is approx 190 mm long and 130 mm dia, yours if it is any good to you.

**KBs PensNmore** · 18th February 2015, 10:00 PM

Thanks Mark, but I think it's to big to go in the allocated spot. Will keep it in mind though. Did you get your steel for the taper turning attachment yet?
Thanks and Regards
Kryn

**Michael G** · 19th February 2015, 07:24 AM

Originally Posted by KBs PensNmore

The motor I'm looking for is similar to the Jet mini lathe variable speed motor, about 75 mm diameter and 100 mm long.

I have a Bodine 230V motor here that is around 85mm in diameter and 120mm long. It has a 1/4" shaft and spins at 1500rpm but is only nameplate rated at 1/50 hp (15 watts?) - seems really small. Current input is stated as 0.5A so it draws 115W. If those numbers are real it is shockingly inefficient.

Anyway, it's here. The project it was for has long since been parted out and split up so sing out if it is any use. I'm having trouble imagining this driving a lathe though as I'm used to things 3/4hp and up.

Michael

**KBs PensNmore** · 19th February 2015, 01:37 PM

Thanks Michael,

will check mine out, when it cools down a bit

Kryn

Thread: Home Shop Machinist Magazine

Thread Tools

Search Thread

Similar Threads

Home Shop Machinist Magazine march/apri l2013

Home shop machinist mag

Scraping for the Home Shop

House and Home magazine

Woodworking at Home DVD Magazine

Tags for this Thread

Posting Permissions