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Member postings for Jim Nic

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

Thread: The Workshop Progress thread 2018
16/05/2018 22:00:40

Well done George.

yes, yes, yes

Jim

15/05/2018 13:48:39

Look on the bright side George, at least you don't have to worry about what your next project is going to be yet. wink

Jim

12/05/2018 12:35:02

George

That's the same drawing as I used. I checked my engine last evening and there is no appreciable leakage past the valve at its operating pressure of less than 10 pounds per squinch.

Just a couple of suggestions of possible causes for your problem could be: incorrect valve dimension, a less than good fit between valve and bore, or incorrect positioning/range of movement of the valve. Given that the valve is made to drawing how closely does it fit the bore? If that is satisfactory is the throw on the eccentric correct and is the valve rod the correct length and set to move the valve at the correct time in the crank cycle?

Jim

11/05/2018 16:17:58

George

I've checked my retained drawings and have noted no "improvements" to Stew's design so all I can say without stripping the engine is that the valve is made to drawing.

The valve chest is almost to drawing, the only changes are making it with a closed bottom end (rather than boring it all through and then plugging it) and putting the exhaust holes on the front face to facilitate a cover with an exhaust pipe.

Where is the leaking air in your engine going? My valve may also leak but any air could only go down the exhaust pipe and I wouldn't know! (I'm now going to have to go and check, of course)

Jim

11/05/2018 12:55:41

George

I'm a little puzzled by your having problems with the spool valve on your Vertical Cross engine as in my experience they are normally simple to make and reliable. I have a total of 5 such valves on 3 different engines, all have used 6mm silver steel rod as the basis for the valves working in a 6mm reamed bore.

These from my Paddleduck are the most complex:

spool valves.jpg

Good luck with the investigation, I hope whatever cure is required is not too drastic.

Jim

Thread: Metal spinning without the need for skill, well almost without the need
08/05/2018 10:45:20

Fascinating and informative, thanks for showing us.

What is the blank made from and do you prepare the metal in any way? (Other than making it the size you need.)

Jim

Thread: Where can I get this hole aligning tool
26/04/2018 15:10:37

The half diameter pin has not rotated out of position, it is designed like that so that the pin can be inserted through a close tolerance hole of the same diameter as the pin. When the screw is tightened the oversize half of the pin is pulled up and catches against the underside of substrate panel and the main body grips the patch. Hence the name "Gripper Pins". I still have a few from my aircraft fixing days.

Jim

Edited By Jim Nic on 26/04/2018 15:11:23

Thread: The Workshop Progress thread 2018
19/04/2018 21:48:12

George

As a matter of interest, where do you get these castings from?

Jim

Thread: Perfecto Shaper Video
15/04/2018 14:25:36

By 'eck, that looks a good machine now you've fettled it Stew.

I've never seen a shaper in action before but now I've seen yours I think I need one. It takes a decent cut off and leaves a fair finish as well.

Jim

Thread: The Workshop Progress thread 2018
08/04/2018 19:38:46

Like this George?

Vertical cross valve guide 2

I thought it looked better matched to the cylinder

Jim

Thread: Warco WM250 Lathe and Warco WM18 Milling machine (Advice please)
03/04/2018 11:49:29

STK

Why not ask them?

Jim

Thread: Another newbie
31/03/2018 11:46:34

Welcome Paul.

Nothing at all wrong or annoying with newbie questions. Where in the world are you?, your location sometimes has a bearing on any advice offered.

Jim

Thread: The Workshop Progress thread 2018
30/03/2018 21:55:55

I haven't made a lot of progress on the Hasbrouk Rocking Valve Engine of late. For one thing other priorities have got in the way and for another I haven't really taken to this project like I have with all my previous engines. However I like to finish what I've started so on we go. Here are a couple of "family shots" of the cylinder and crosshead and the crankshaft in its bearing pedestals.

Hasbrouk family shot 1.jpg

Hasbrouk family shot 3.jpg

I am making the engine smaller than the original drawing so the next step is the connecting rod and then I can confirm my dimensions and get the cylinder and crankshaft mounted on the baseplate.

Jim

Thread: Good source of gear to make threading attachment for lathe
27/03/2018 22:43:26

Good for you Chris. As I said, I would be interested to see how you do it (and I wasn;'t being facetious) so I hope you can enlighten us when you have completed it, perhaps by updating this thread.

Jim

26/03/2018 20:30:56

I'll be interested to see how you arrange the gears to drive your leadscrew on a Unimat 3.

The U3 I have has no mechanical connection between headstock mandrel and leadscrew. The only drive I have seen is a mechanism which connects to the end of the leadscrew and takes it's drive via a rubber belt off the motor pulley as a means of feeding the crosslide, but that has a fixed ratio.

Jim

Thread: Un workable steel
25/03/2018 12:10:52

I came on a piece of 3" dia steel bar of unknown composition a while back and kept it as a "come in handy". When I found a use for it and tried to machine it I could cut it only with carbide tip tool and then only if I ran it at a very low speed and with a small cut. Even then my lathe was working hard but I kept going because the steel was "too good to chuck away".

The result was that after an hour or so continuous working I had overheated and burnt out my lathe motor.

An expensive lesson! I now only have material that I have bought and know it's composition.

Jim

Thread: Broken tap in copper boiler
18/03/2018 20:27:57

Thanks for the good news update.

Jim

Thread: The Workshop Progress thread 2018
14/03/2018 20:04:57

George

I did notice that you had located your nice brass spacers on top of the entablature whereas Stew's original drawings show them underneath. I thought you had done this to show off your brass polishing skills and had adjusted the pillar length to compensate. The difference would be 10mm.

The solution to your problem may be as simple as to locate the spacers between the pillars and the entablature.

Jim

13/03/2018 23:37:29

It's all a matter of personal taste of course but I think the brick effect looks a lot better than the previous all over tiling. Good choice.

Jim

12/03/2018 00:32:35

Stunning work on the oiler Jason.

And the Root and Van Dervoort is pretty impressive too, I love how the cart turned out.

Jim

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