Member postings for Alain Foote

I have a 10 inch disc sander which I use regularly for steel.

You could try here **LINK** this is now sold by Steam Workshop I believe, but was designed for underframes so may be suitable.

Stephen are you using a tapping compound e.g. Rocol RTD? Especially helpful if it’s stainless steel or gauge plate etc. What size thread/pitch/thread form? What is the material grade?

Alain

Here is a ready made one **LINK**

Model Engineers Laser do Blower parts, don’t know if it’s for Cliff’s design though.

Thanks Norm, the old ones were single piece body, but the new ones will have a two piece body so that it will certainly be possible to get a good finish and concentricity on the seat.

Thanks Jeff, that’s useful, Alain

I am making some new safety valves for my 7 1/4 NG loco to the Gordon Smith design. I was wondering whether it is intended that the ball should be fixed in the guide/shroud or allowed to rotate. Any thoughts? Also any thoughts on whether to use the light hammer tap to seat the ball or whether to burnish the seat using Brasso or lapping compound, what do you think?

The existing safety valves were made to the EIM drawing scaled up, but this time I am making them a two piece body to the 7 1/4 NG design from Polly. I have never been happy with the old valves because they don’t reseat properly until the pressure has fallen by 15 to 20 p.s.i and even then they leak a bit!

Hello Bob I confirm that on my drill it is 3/8" BSF see pictures.

Edited By Alain Foote on 24/10/2022 16:16:19

Bob, I have measured my Meddings, it is 60 deg.

Have you tried [email protected]?

Sorry fizzy, but couldn’t find a spare in the workshop. Looks like you are sorted now anyway.

I may have a spare 240V one in the workshop, will look tomorrow.

Alain

Try Model Engineers Laser **LINK**

14.75 mm is the tapping size for 3/8” British Standard Pipe Thread which is 19 tpi. As previously mentioned the tapping drill for 3/8” UNC is much smaller at around 5/16”.

I have something if you message me with your email Leslie

Alain

DAG Brown Model Engineer 1994 no. 3968 is a good starting point.

Thanks Phil, I’ll try that.

Alain

Well I tried the Black Engravers wax and that was a failure. I think the trouble is that the markings are not deep enough. Might give up and buy a new rule!