Grub screws for Portescap Final drive gears

Model and prototype rolling stock, locos, multiple units etc.
Richard Harper
Posts: 15
Joined: Tue Dec 02, 2008 1:17 pm

Grub screws for Portescap Final drive gears

Postby Richard Harper » Thu Aug 15, 2013 8:29 am

Can anyone please advise me where I can get a replacement grub screw(s) for an original Portescap Final drive gear?

User avatar
Mike Garwood
Posts: 604
Joined: Sun Aug 03, 2008 4:51 pm

Re: Grub screws for Portescap Final drive gears

Postby Mike Garwood » Thu Aug 15, 2013 9:56 am

Try these chaps...an email with what your looking for should do it.

http://www.portescap.com/contact-customer-service.html

Mike

User avatar
Horsetan
Posts: 1180
Joined: Tue Jul 29, 2008 9:24 am

Re: Grub screws for Portescap Final drive gears

Postby Horsetan » Thu Aug 15, 2013 9:26 pm

Mike Garwood wrote:Try these chaps...an email with what your looking for should do it.

http://www.portescap.com/contact-customer-service.html



You may struggle with that. Portescap distribute the motors, sure, but they weren't responsible for the gearbox or gears which I think were the work of Davall....
That would be an ecumenical matter.

User avatar
Mike Garwood
Posts: 604
Joined: Sun Aug 03, 2008 4:51 pm

Re: Grub screws for Portescap Final drive gears

Postby Mike Garwood » Thu Aug 15, 2013 10:07 pm

Still got to be worth an email though - surely?

Richard Harper
Posts: 15
Joined: Tue Dec 02, 2008 1:17 pm

Re: Grub screws for Portescap Final drive gears

Postby Richard Harper » Fri Aug 16, 2013 10:11 am

Thanks for the tip. However, they don't have any details in their archives and are unable to help.

User avatar
Mike Garwood
Posts: 604
Joined: Sun Aug 03, 2008 4:51 pm

Re: Grub screws for Portescap Final drive gears

Postby Mike Garwood » Fri Aug 16, 2013 10:48 am

Not being one to give up without exhausting every avenue - and I suspect there are a few of us would like some of these - this is the Duvall site.

http://www.davall.co.uk/

I have emailed them to see if they can help.

Mike

Thanks for that info Ivan...

User avatar
grovenor-2685
Forum Team
Posts: 3451
Joined: Sun Jun 29, 2008 8:02 pm

Re: Grub screws for Portescap Final drive gears

Postby grovenor-2685 » Fri Aug 16, 2013 11:04 am

Surely its just a matter of finding out what thread is used (trial and error?) and then it is simple to make your own grub screw.
If I can locate my box of motors over the weekend I'll have a look.
Keith
Regards
Keith
Grovenor Sidings

jayell

Re: Grub screws for Portescap Final drive gears

Postby jayell » Fri Aug 16, 2013 11:15 am

grovenor-2685 wrote:Surely its just a matter of finding out what thread is used (trial and error?) and then it is simple to make your own grub screw.
If I can locate my box of motors over the weekend I'll have a look.
Keith


Chances are it was a small BA thread unless the gerabox makers had been seduced into going metric :twisted:

John

User avatar
Weskie
Posts: 44
Joined: Sat Jul 26, 2008 1:12 pm

Re: Grub screws for Portescap Final drive gears

Postby Weskie » Fri Aug 16, 2013 9:32 pm

johnlewis wrote:
grovenor-2685 wrote:Surely its just a matter of finding out what thread is used (trial and error?) and then it is simple to make your own grub screw.
If I can locate my box of motors over the weekend I'll have a look.
Keith


Chances are it was a small BA thread unless the gerabox makers had been seduced into going metric :twisted:

John


Just tried the 'trial and error' method. BA threads won't fit. The grub screw measures 1.5mm not sure of the pitch though. I've got a pitch gauge at work, I'll try to remember to bring it home tomorrow.
Andy Westcott

User avatar
Horsetan
Posts: 1180
Joined: Tue Jul 29, 2008 9:24 am

Re: Grub screws for Portescap Final drive gears

Postby Horsetan » Fri Aug 16, 2013 9:55 pm

May well be metric. After all, the motor itself is Swiss......
That would be an ecumenical matter.

User avatar
Weskie
Posts: 44
Joined: Sat Jul 26, 2008 1:12 pm

Re: Grub screws for Portescap Final drive gears

Postby Weskie » Sat Aug 17, 2013 1:58 pm

Tested the pitch of grub screw, it comes out at 0.35 pitch. but searching for m1.5 x 0.35 doesn't seem very common, m1.6 looks more readily available.
Hope that helps !
Andy Westcott

User avatar
grovenor-2685
Forum Team
Posts: 3451
Joined: Sun Jun 29, 2008 8:02 pm

Re: Grub screws for Portescap Final drive gears

Postby grovenor-2685 » Sat Aug 17, 2013 4:34 pm

Found the right box, the scew measures 1.5mm OD , same as 10BA, but a 10BA screw jams after a couple of turns so it is almost certainly metric.
Measuring the pitch is more of an excercise than I was ready for so I'd go with Weskie on that.
Keith
Regards
Keith
Grovenor Sidings

nigelcliffe
Posts: 605
Joined: Mon Jul 21, 2008 8:31 am

Re: Grub screws for Portescap Final drive gears

Postby nigelcliffe » Sat Aug 17, 2013 4:56 pm

Many screws come out a little under their nominal diameter. So, the measured "1.5mm" is probably M1.6, not least because M1.6 x 0.35 is a standard ISO thread.

If the original poster has a fasteners specialist supplier in their town, they'll probably be able to help. There is one local to me in Ipswich (on Boss Hall industrial estate for anyone who is over this way), and "1 screw" is usually the minimum over-the-counter order. The prices are usually very low.

At worst, if a brass or steel screw with a head can be bought, the head can be cut-off to produce a short bit of studding, and a small piecing saw used to cut a slot in the end for a straight screwdriver grub screw.
If working on small screws, holding them in a nut makes them easier to work on, and use shellac (French polish) to lock the thread if you struggle with the thread rotating. Shellac can be dissolved with meths and melts at about 70 centigrade, so very easy to dismantle any temporary fixing.


- Nigel

User avatar
Wizard of the Moor
Posts: 184
Joined: Mon Jul 21, 2008 9:02 pm

Re: Grub screws for Portescap Final drive gears

Postby Wizard of the Moor » Sat Aug 17, 2013 6:16 pm

Sharman Wheels used to sell packets of M1.6 grub screws. I purchased such a packet from Precision Paints at a show sometime in the last few years. It might be worth giving them a ring to see if they have any left.
James Dickie

My workbench

Philip Hall
Posts: 1582
Joined: Mon Aug 10, 2009 7:49 pm

Re: Grub screws for Portescap Final drive gears

Postby Philip Hall » Sat Aug 17, 2013 10:01 pm

Another solution might be to drill out the existing hole in the gear a little and re-tap it for a BA or metric thread for a screw size that is readily available.

Philip

Alan Turner
Posts: 576
Joined: Sun Jul 20, 2008 4:24 pm

Re: Grub screws for Portescap Final drive gears

Postby Alan Turner » Sun Aug 18, 2013 6:07 am

A 10 BA screw has a diameter of 0.067" and thread pitch of 72.6 TPI. This translates as 1.7mm diameter and 0.35mm thread pitch.

A 1.6mm ISO thread has a diameter of 1.6mm and a thread pitch of 0.35mm.

regards

Alan

User avatar
Guy Rixon
Posts: 803
Joined: Sun Mar 27, 2011 6:40 pm

Re: Grub screws for Portescap Final drive gears

Postby Guy Rixon » Sun Aug 18, 2013 3:44 pm

Eileen's sell M1.6 cheesehead screws that might be modified to make grub screws. However, they only sell brass ones, not steel.

User avatar
Jol Wilkinson
Posts: 838
Joined: Mon Jul 21, 2008 7:39 pm

Re: Grub screws for Portescap Final drive gears

Postby Jol Wilkinson » Sun Aug 18, 2013 7:11 pm

Socket head M1.6 grubscrews available here.
http://www.modelfixings.co.uk/cup_point_grub_screws.htm

Also lots of other useful stuff.

User avatar
Mike Garwood
Posts: 604
Joined: Sun Aug 03, 2008 4:51 pm

Re: Grub screws for Portescap Final drive gears

Postby Mike Garwood » Mon Aug 19, 2013 1:51 pm

And here's the reply I got from Duvall.

"Good morning Mike
Initial answer is no, Davall have not been agents for Portescap, but we may have used one of their motors with a gearbox designed by Davall.
If the gearbox is Portescap, then no.
Best regards

Peter Kelly
Davall Stock Gears ( a business unit of Davall Gears Ltd )"

Seems the way to go has already been thought of, just goes to show what a great resource the forum is!

Mike


Return to “Trains: Model and Prototype”

Who is online

Users browsing this forum: No registered users and 1 guest