By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale Jan 24th

Hello from West Sussex, looking for ID for my first lathe

All Topics | Latest Posts

Search for:  in Thread Title in  
Hopper01/06/2020 01:28:09
avatar
4530 forum posts
94 photos

As you are starting from scratch, you might be able to buy a set of Chinese mini lathe change gears and adapt them to suit.

JAMES HUGGINS01/06/2020 05:55:43
11 forum posts
5 photos

I'll take some measurents later and let you know. When you say drummond round bed is that the one with the big tubular radial arm looking bed?

Keith Long01/06/2020 10:34:37
832 forum posts
11 photos
Posted by JAMES HUGGINS on 01/06/2020 05:55:43:

When you say drummond round bed is that the one with the big tubular radial arm looking bed?

Yes, the lathe with the cylindrical cast iron bed.

JAMES HUGGINS01/06/2020 15:50:36
11 forum posts
5 photos

So from the middle of the spindle to the casting below is 4 5/16", point of tail stock to bed is 3 1/2". Does anyone have any dealings with RDGTools? Seems cheap but would might be OK as a starter chuck, don't want to break the bank on a chuck if the lathe ends up being a chocolate tea pot

magpie01/06/2020 16:29:14
avatar
456 forum posts
80 photos

RDG tools give good service, but not so hot on quality with some items.

Dek

Andy Carlson01/06/2020 17:29:02
230 forum posts
97 photos

Not sure which RDG chuck you mean... they have 'economy' ones, HBM and Pratt Burnerd ones. The latter are a very well regarded brand (and cost more). I can't speak for the other two but others may have some experience.

The snag from your perspective is that all of them will need a backplate and the backplate needs to fit both your lathe spindle and the specific chuck.

This page explains a lot about backplates http://www.lathes.co.uk/latheparts/page7.html

If you look at one of the RDG listings you will see it tells you the 'locating recess diameter' - this is the diameter of a step that needs to be turned on the front face of the backplate. This step should be a close fit for the chuck recess because it keeps the chuck concentric with your spindle.

The listing will also tell you the 'PCD' or pitch circle diameter. Your backplate will need holes to accept the screws which will hold the chuck onto the backplate. The centres of these holes must be exactly half of the PCD away from the centre of the spindle. A 3 jaw chuck will need three holes equally spaced around the circle. A 4 jaw chuck will need four.

Backplates can be machined from blanks but it's not an ideal job if you are learning... plus you need a working lathe.

old mart01/06/2020 18:12:05
1756 forum posts
138 photos

It's a shame about the lockdown, there is a little faceplate about 5" diameter lying in some junk at the museum, and the thread is small, but I can't get in there to look at it.

JAMES HUGGINS01/06/2020 18:34:02
11 forum posts
5 photos
Posted by Andy Carlson on 01/06/2020 17:29:02:

Not sure which RDG chuck you mean... they have 'economy' ones, HBM and Pratt Burnerd ones. The latter are a very well regarded brand (and cost more). I can't speak for the other two but others may have some experience.

The snag from your perspective is that all of them will need a backplate and the backplate needs to fit both your lathe spindle and the specific chuck.

This page explains a lot about backplates http://www.lathes.co.uk/latheparts/page7.html

If you look at one of the RDG listings you will see it tells you the 'locating recess diameter' - this is the diameter of a step that needs to be turned on the front face of the backplate. This step should be a close fit for the chuck recess because it keeps the chuck concentric with your spindle.

The listing will also tell you the 'PCD' or pitch circle diameter. Your backplate will need holes to accept the screws which will hold the chuck onto the backplate. The centres of these holes must be exactly half of the PCD away from the centre of the spindle. A 3 jaw chuck will need three holes equally spaced around the circle. A 4 jaw chuck will need four.

Backplates can be machined from blanks but it's not an ideal job if you are learning... plus you need a working lathe.

When you say exactly, are you talking scribed and centre punched by hand and drilled in a pillar drill? Because that isnt out of my capability or are you talking via a milling machine? My father in law has a large functioning lathe and I know people who have access to industrial machinery at a heritage railway so if its not something I can do in my workshop, I can get it done elsewhere.

JAMES HUGGINS01/06/2020 18:34:36
11 forum posts
5 photos
Posted by old mart on 01/06/2020 18:12:05:

It's a shame about the lockdown, there is a little faceplate about 5" diameter lying in some junk at the museum, and the thread is small, but I can't get in there to look at it.

Thanks for the kind thought though 😊

Andy Carlson01/06/2020 19:01:18
230 forum posts
97 photos
Posted by JAMES HUGGINS on 01/06/2020 18:34:02:
Posted by Andy Carlson on 01/06/2020 17:29:02:

When you say exactly, are you talking scribed and centre punched by hand and drilled in a pillar drill? Because that isnt out of my capability or are you talking via a milling machine? My father in law has a large functioning lathe and I know people who have access to industrial machinery at a heritage railway so if its not something I can do in my workshop, I can get it done elsewhere.

The parts where the fit is critical are the machined surfaces that fit your spindle, which is the back face (or at least the middle of it), the threaded hole and the conterbore. The outside diameter just needs to match your chuck for appearance sake. The chuck registration step is best left a little oversize initially and finished on your own lathe. The PCD holes are not too critical if they are plain holes but more tricky if they need to be threaded.

It will most likely be cast iron which is not the nicest stuff to machine.

I'd strongly recommend that you get someone to help you.

Swarf, Mostly!01/06/2020 19:27:51
528 forum posts
47 photos

James:

You have a PM.

Best regards,

Swarf, Mostly!

JAMES HUGGINS01/06/2020 19:41:48
11 forum posts
5 photos

OK well that all sounds good to me. I'll get my father in law to help turn the recess in the back plate when I get one if I don't manage to find one that is matched to a specific chuck. It's just what to search for chuck wise really to begin with. Oh and also a small pulley to fit my motor. I will get some round belt for the 7mm pulleys but I will also need a small pulley, any recommendations of where to buy?

old mart02/07/2020 18:31:46
1756 forum posts
138 photos

There are a couple of faceplates I just noticed on ebay, they might be the right size for your lathe. 303607680392

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
emcomachinetools
Eccentric July 5 2018
Warco
Allendale Electronics
ChesterUK
cowells
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest