Member postings for Garry Coles

Hi, What material do people use for the governor drive belt. My pulleys are 1/4 in wide. At the moment I am looking at a flat shoe lace, but joining the ends is proving to be a bit awkward.

Garry

Okay Jason, I hadn't thought of it that way, perhaps I should go back to using the 4 inserts again.

Hi,

I thought I would mention about a cost saving exercise that I have done.

I have a 50mm dia surface face milling tool which has 4 carbide inserts. These inserts (APMT 1604) are quite expensive (£ 3.50-4.50) each so I experimented with using only 2 of them in apposing positions for balance. It seems to do the milling job the same as with 4 inserts but with a little bit more noise and using a slower feed rate. The finished surface is about the same. I can't see a reason not to do this as a fly cutter has only 1 cutting tool.

Hope this tip is of use of use someone.

Garry

Thanks Brian. Have looked at some online and yes they are quite pricey.

Hi. I've got a lot of tools, like spanners & tooling bits etc that are picking up swarf all the time. Very annoying having to wipe them down all the time. Is there a way to de-magnetise them or do I have to put up with it.

Is there anybody that can give me some advice please.

Thanks

Garry

Thanks for that info Nick. The keyways are in the axle for the my 2in scale D & NY traction engine. I would have thought the load would not be that great.

Hi, I would like to know if key steel is any different to BMS. The reason I ask is I'm cutting some 3/16 keyways in a axle and I have got some 3/16 x 3/16 BMS in stock.

Thanks.

Garry in sunny Jersey.

Thanks for that, That's the number I was thinking about using, I just wanted confirmation.

Good morning all. I'm going to be fabricating the crankshaft for my 2in D & NY traction engine and was wondering which loctite to use. I've got 290 and 603 on the shelf, but is there a better one for this job. Also if you say to use another number what sort of fit should the parts be for that number.

Thanks Garry

Thanks both of you. I'm going to go along with the hot & cold idea. That does away with over stressing of the parts while pressing them together at room temp.

Garry

Hi, A question on the press fit size of the cylinder liner into the cylinder block on my 2in scale D & NY traction engine. I've bored out the cylinder block and am now turning down the cylinder liner. Both are cast iron. The bore size is 1 5/8. (1.625" I've worked out the press fit size for the liner as being just over 1 & half thou .001625" using .001" per 1in is this the right size please, or have I miss calculated. Thanks

Well in the end I think I will stick to using the steel studs I have already. Thanks everyone.

Thanks everyone for your replies. I've already made up some 4BA steel studs but I wanted to use PB to get away from the corrosion of steel to the studs. I was going to use Stainless steel in the beginning, but some one said that's a no go for copper boilers!

OOPS ! I got the sizes back to front. I meant to say that the drawings say 4BA and I can only find PB in 1/8 5BA size.

Hi, I'm building the 2in scale D & NY Traction Engine and I want to make the cylinder studs, which the drawings state are 5BA that go into the boiler barrel in phospher bronze. But I can only find PB in 4BA size. Will this one size smaller be OK. There are in total 24 studs.

Thanks

Garry

Hi. I am now making the safety valves for my 2 in D & NY traction engine. The springs on the drawing state 22 SWG .125" I.D. & .181" O.D. but does not give the free length. The working boiler pressure is 85 psi. The plunger overall length is 3/4 in and with the adjusting centre screwed down to the approx position, there is a gap of about 1/2 in for the spring. I think I could trial & error when the boiler is in steam, but I need a starting point. Can anyone help me please.

Garry

The size of the copper tube is 3/8 x 21 g and the bends are like the one in JasonBs picture. I now know I can use lead thanks to Hopper. Cheers

Well, thanks for all the comments, but i'm not any the wiser about using lead!

Hi, I need to put some bends in copper tube for the exhaust pipe from the cylinder to the chimney on my Traction engine. And I don't want it to collapse. I was wondering if lead is melted and poured down the tube, this will work the same as cerrobend (woods metal). I know I can buy Cerrobend on line, but living in Jersey the postage gets a bit silly. And I have plenty of lead in stock.

Garry

Thanks everyone for your replies. I will now make the end covers out of cast iron as suggested.
Garry