MadModder

The Shop => Tools => Topic started by: John Rudd on January 23, 2015, 02:44:04 PM

Title: Leadscrew thread
Post by: John Rudd on January 23, 2015, 02:44:04 PM

My Ajax mill is going to be my next major project as it needs refurbishing.....
One thing I gave noticed is the Y axis leadscrew thread is not the same as the X......
I suspect the orig has been replaced at some time and looks to be a BSW thread form....

So, I'd like to sort this,so was thinking of using a BSC thread, basically because I can get the taps and dues for 20 tpi.....

Is this the right way of going about this or should I be looking at a different thread form?

Title: Re: Leadscrew thread
Post by: Manxmodder on January 23, 2015, 02:58:00 PM

John, Acme form is normal and preferred thread form for imperial leadscrews and trapezoidal form if they're metric.

There are several reliable suppliers of both thread forms and leadscrew nuts in various shapes and materials in the UK......OZ.

 

Title: Re: Leadscrew thread
Post by: DavidA on January 23, 2015, 03:43:02 PM

This may be slightly off topic,  but has anyone noticed the the scissor and side jacks as provided with cars spare wheels often have square threads. ?

They tend to be right hand thread,  but for someone experimenting, they could be a source of lead screw material.

Dave.

Title: Re: Leadscrew thread
Post by: steampunkpete on January 24, 2015, 06:08:05 AM

The following might be useful. Some sizes even supplied in left-hand threads if required.

http://www.haydonkerk.com/LinearMotionProducts/LeadScrewsAndNuts/LeadScrews/LeadScrewSizes/38in10mmLeadScrew/tabid/247/Default.aspx

Title: Re: Leadscrew thread
Post by: David Jupp on January 25, 2015, 03:48:06 AM

Or for something geographically closer - Kingston Engineeering in Hull stock ACME & Trapezoidal in a range of standard sizes. 

There are a few other UK suppliers.