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Member postings for Chinkoa

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

Thread: Best PTFE. for rings Virgin or filled, carbon/grahite
12/04/2020 10:26:41

Which is best PTFE. for inlet Steam Bobbins rings. Virgin, Filled Carbon PTFE, or Graphite filled PTFE?

For the amount of use it will get I am leaning towards the Virgin variety.

What sizes and clearances for a 15/16 Dia. Bore? Diameter, Width and thickness.

I am thinking of fitting two rings insame groove and making the total width the same as the inlet port (1/4" 2 x 1/8" wide rings.


Thread: Piston Rings 1.1/2" diameter.
31/03/2020 14:54:02

Just had a dummy run with a 0.150" spacer and got 5lbs/sq" I am aiming for 6/7 so back to the propane burner.


31/03/2020 10:50:58

I am in the process of making Piston rings for my 5" Gauge Mrchant Navy Class Loco. The rings are made and I am about to heat treat them according to all the inforamtion out there from Cain/ Trimble. I have made rings before and got good results but this is a big loco and I do not want too high a wall pressure as I want o be able to turn it over. My problem is wall pressure. Cain recommends 8 to 12 Lbs/Sq." My question is what is the initial gap I start with in the Piston ring in the heat treatment jig that will put me in the ball park for the 8 to 12 Lbs./Sq." Reading further suggests that a lower figure is perhaps better. I have made enough Rings to have several attempts/failures. Measuring the wall pressure according to Tubal Cain in ME.Issue 172/1994 is fairly straightforward.

Thread: Making leaf spring buckles
28/06/2019 17:03:09

Does anybody have experience of making Leaf spring buckles. Hole size 3/4" x 3/8" 3/8" thick. I have had quotes for Laser and waterjet. and they are just too expensive for me. I have 6 to make for the Engine and 6 slightly smaller ones for the Tender.

I have a choice of materials Steel or Brass. The method I have in mind is to drill out rhe four corners with a small drill. Take the bulk of the material out with two larger drills in the hole and the then with a small Endmill remove the rest of the stock and finish the corners with a tri file.

Unless any body has a better method I can use?

Thread: Imperial Tube
22/04/2019 06:54:03

Hi Jeff,

West Yorkshire


21/04/2019 22:56:28

Thanks for that Jason.

i am not in MJs area but iwill try them. My lathe won't entertain 165mm, I can get it in but I cannot turn as the saddle won't pass underneath the Tube.


21/04/2019 20:27:03

It's for a 5" Gauge Merchant Navy Class


21/04/2019 20:25:38

Hi Jason,

Yes MJ. list one but they can no longer supply?


Yes it's supposed to be 10G. The Smokebox is 10.3/16" long.

I have a 6.25 OD. Copper tube but it has a few dints in it that I mighthave to work around if I cannot find an Imperal tube supplier. My friendly neighberhood fabricating shop has rolls but cannot get down to 6" ID.


21/04/2019 19:53:28

Any ideas for a supplier. Need for a Smokebox.

Thread: Bulleid 5" Gauge Light Pacific
22/03/2019 18:32:08

Hi John,

I have just loaded to my Album several Photos showing differences


22/03/2019 17:46:54

Hi Bill,

Thanks for your reply. I got my Drawings for the Ariel MN. From MJ Engineering. When I read your reply I looked at the drawing again (DWG. 19) in case I had missed someting but it shows only one tender with no variations. Your right there were several versions of tender firtted over time to these Locos. There must be a drawing for this Tender whether it is a MN. derivative or a light Pacific as the Tender came with Phosphor Bronze Bearing Block casting with the Logo SR. cast into them. they are too big to fit the Ariel Tender. Unless the previous owner had these cast to his pattern which I think is unlikely.


22/03/2019 17:01:49

Does anybody have Drawings for a 5" Light Pacific Tender That I could talk to about it? I have no idea who supplies these Drawings.

I have recently picked up a part finished tender supposedly for a 5" Merchant Navy Class Loco that I am building, but on closer inspection I find that the Tenderit has not been built to the Ariel drawings and is, among other things, a little shorter and the Horn slots are a lot wider than on the Ariel drawings. I suspect that it is a light Pacific Tender but I am far from sure. I would like to get it confirmed or not.

Thread: Cladding, Help wanted
04/03/2019 11:34:43

Hi John,

Did you get my Photographs?


28/02/2019 08:11:26

Hi John,

Re. Email I will try again.



25/02/2019 20:49:45

I have two 5" Locos that I need to start cladding. Does anybody know of any books or articles in ME. that cover it. The cladding material I do not have a problem with. But the techniques of joining the cladding where the Steam dome joins the boiler and how to join the Belpair cladding to the boiler. Also the techniques for lining up any Bolier fitting the cladding around and finishing, IE Clack valves, safety valves etc, in the Cladding. Neither of the Boilers are tapered.

Thread: Elliot Victoria Juniormil
01/05/2018 10:04:24


Thanks, But it must be me .Tried both versions and got nothing


01/05/2018 09:36:14

Thanks to Paul and Philip for their help and PDFs.. One last bit for Philip Whats the full tittle for the Yahoo Forum. I have done a rudimentary search and come up blank.

Paul mine is not the omnimill bur the Juniormil, The one that the Vertical bit is detachable when going over to the horizontal function. I am still very pleased that \i came across one that had been looked after for at least the last twenty years.


30/04/2018 18:08:27

Can any member tell me if it is possible to split in two an "Elliot Victoria Juniormil"? Much like you can with a "Tom Senior"

I am going to move one these, as yet unseen and it would be a lot easier for me if it was in two halves. Any constructive replies will be welcomed.

Thread: Tool post grinding
25/04/2017 16:38:32


Confidence in your replies are now fully restored. Norton have not replied yey?


24/04/2017 14:19:12


I didn't intend to mount the Grinding wheel on the motor. I will put a Suitable set of Picador pulleys one on the motor and one on the grinding wheel spindle then I can get somewhere near a reasonable M/S


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