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Member postings for Peter Simpson 1

Here is a list of all the postings Peter Simpson 1 has made in our forums. Click on a thread name to jump to the thread.

Thread: Cutting holes in copper
09/05/2021 18:56:44

I need to cut two 1inch diameter holes in 1/8th copper sheet. I was thinking of using a step drill up to 22 mm then using a boring head to complete the job. Is there a better way ?

Thread: Is this a new scam?
30/04/2021 19:27:50

Have been using ebay for ages but rarely sell stuff now. I do not feel inclines to give them my bank details. Looks like it will by buying only in the future.

Thread: Boiler barrel
27/04/2021 11:31:14

The boiler barrel on my 5" gauge BR Standard 2 has dimensions of 12" long, 4.5" diameter at the front tube plate and 5" diameter at the throat plate and is a true taper along it's length. As I do not have a set of rollers, would it be practical to purchase a 13" length of 5" OD copper tube and cut it down the centre line then form the taper over a wooden former ?

Thread: Citric acid pickle
13/04/2021 09:37:44

I have a nice gallon container with a sealable lid what is the best ratio of citric acid to water.

13/04/2021 08:57:53

I want to pickle the throat plate of my 5" gauge boiler. If I mix up some citric acid pickle solution, how long does is stay usable once the item has been cleaned. Can I use the solution a week later ?

Thread: Boiler flanging plates
13/03/2021 10:14:33

Mike I had a Saturday morning senior moment and missed out the thickness if the tube plate flange thickness, But thanks for confirming the forming plate dimensions.


13/03/2021 07:58:51

Hi All

I intend to make a couple of forming plates to make the front tube plate for my boiler. The OD of the boiler is 41/2" in diameter and the the wall thickness is 2mm Should the diameter of the forming plate be 41/2" minus 4mm ? Or is there an allowance made for fabrication.

Thread: Steam brakes
06/03/2021 08:03:34

Hi Nigel I have made and fitted the drain cocks, The plans omit all of the details of the valves the method of operation the route of any cable, where the operating lever sits within the cab. I have tried bicycle cable in the past but think a solid rod running in a tube is the best method. I will just have to design a route for the tube.

02/03/2021 11:08:14

Thanks Nigel, I thought that would be the case, but as I say the plans do not make that area of the loco obvious, just like the total lack of info for the operation of the cylinder drain cocks.

02/03/2021 10:07:30

Hi guy's, this might sound a stupid question. At the moment I'm fabricating the brake parts for my Don Young's BR standard 2 loco. I have made the brake cylinder and majority of other parts. As the diagrams are not obvious. Is steam applied to the cylinder to put the brakes on, or does the return spring keep the brakes on, and the steam release the brakes ?

Thread: O ring groove profile
18/02/2021 08:58:41

Looking to machine the piston for a steam brake cylinder, The bore 13/16th The groove could be machined to suite a suitable O ring. Does the O ring need to be a snug fit in the machined groove ?

Thread: Myford drive belt
31/01/2021 09:27:13

What I find strange is a very simple thing as changing a belt opens up two distinct camps, I have a S7 with probably it's original belt which is on it's last legs. I also have a Boxford ME10 which came with a linked belt both lathes operate fine with no issues. My view is both belts work fine, so why bother to strip the spindle down just to fit a belt.

30/01/2021 10:44:38

Hi all, My Myford super 7 drive belt is just about knackered can anybody suggest a suitable replacement, I would rather not split the headstock down to fit an original style belt.


Thread: Mechanical lubricator ratchet wheels
20/01/2021 14:23:01

Ratchet wheels

One old wheel one new, Neither will allow a drill to enlarge the central hole which is 0.090" I have ordered some 3/32" En1a rod to make a new press fir spindle.

20/01/2021 10:46:38

Michael I think you may be right with the sintered suggestion. Looks like the spindle will have to be a push fit into the central hole in the wheel.

20/01/2021 10:23:19

If the wheels are case hardened would they anneal ? They are a dull grey colour so I assume they are not made of silver steel, machined then hardened.

19/01/2021 21:20:39

Tomorrow I make a stepped spindle and press fit the ratchet onto the over size shaft. As the wheel sits in the fork in the actuation arm, gluing would not be practical.

19/01/2021 16:27:58

I purchased a couple of 7/16" x 30 tooth wheels, I want fit them to an 8 BA spindle. The problem is the hole in the centre of the wheel 0,090" which is too big for 8 BA, the easy option would be to drill the centre hole out and fit a brass bush then drill and tap it 8 BA. The problem is the wheels appears to be case hardened and does not want to be drilled. Has anybody come across these wheels ?

Thread: TomSeniorMdel E S head
19/01/2021 12:26:43

If you google Tom Senior S type head there are some Denford exploded diagrams showing most of the head. I used them when I renewed the Timken roller bearings in my S type head.

Thread: Machining Brass
14/01/2021 16:09:14

It's not the machines, as I used end mills, small flycutter which gave the best finish and lathe. This does not occur when machining BMS. All gibs were tightened down so I can think it is the tool geometry.

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