By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale May 23

" 4TPI lead screw nut

All Topics | Latest Posts

Search for:  in Thread Title in  
simon Hewitt 123/05/2019 15:28:32
42 forum posts
6 photos

Does anyone know where I could get a ¾" 4TPI lead screw nut? Outside dimensions not important, its to fit an old pillar drill, the table lift is by lead screw and it has stripped out the thread in the table carrier. Thanks

Simon

John Reese24/05/2019 00:42:21
737 forum posts

It is possible to single point a 3/4-4 thread. I used either a 5/8" or 1/2" boring bar with a very short tool bit. There was not sufficient clearance to withdraw the tool from the hole. I had to back off the cross slide a few thou and wind the tool out of work. I did it on a 13" lathe and it took many, many spring passes to finish the thread. I am not sure how well a smaller, less rigid lathe would handle the job.

Chris Evans 624/05/2019 07:23:04
1417 forum posts

Have you looked at the prices from the lead screw suppliers? It may be quicker and cost effective to buy a length of lead screw and a nut, for rise and fall does the pitch matter ? I did my lathe cross slide for sub £50 and have enough screw for three replacements. Consider going trapezoidal/metric it can be cheaper.

simon Hewitt 124/05/2019 20:27:53
42 forum posts
6 photos

Thanks Chris Evans - I think I will go this route. The screw is almost exactly 1 M long, and as you say, pitch is not critical, it just has two bevel gears and a winding handle. I am tempted to go for a ball screw and lead, and an electric motor, with an up/down switch, just for fun. Also I am not certain it is an Acme thread, looks like a square thread, but its difficult to see clearly until I pull it out. And it weighs a lot!, must be > 150kg.

Michael Gilligan31/05/2019 06:49:24
avatar
13104 forum posts
570 photos
Posted by simon Hewitt 1 on 24/05/2019 20:27:53:

The screw is almost exactly 1 M long, and as you say, pitch is not critical, it just has two bevel gears and a winding handle. I am tempted to go for a ball screw and lead, and an electric motor, with an up/down switch, just for fun. Also I am not certain it is an Acme thread, looks like a square thread, but its difficult to see clearly until I pull it out. And it weighs a lot!, must be > 150kg.

.

Presumably this is the drill pictured in your Album, and nicely illustrated here: **LINK**

http://lathes.co.uk/denbigh-drills-page2/

... If so, I am sure you are thinking along the right lines yes

MichaelG.

simon Hewitt 131/05/2019 08:42:51
42 forum posts
6 photos

What a great illustration. Mine is newer than that with the motor behind the column and modern style multi-sized V pulley, but the main column and the table adjust are exactly the same.

Chinese balls screws are remarkably cheap and I have a windscreen washer motor that will probably do, I will post a photo when complete.

simon Hewitt 131/05/2019 08:45:33
42 forum posts
6 photos

In fact, looking at the lathes site, mine is the K.1.A series 2 on page 2 here

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
ChesterUK
Eccentric July 5 2018
Eccentric Engineering
Warco
Ausee.com.au
TRANSWAVE Converters
Allendale Electronics
Sarik
emcomachinetools
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