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Member postings for Chris Gunn

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

Thread: 3.5mm hex. head screws
21/11/2021 14:42:51

JH, you are right, I searched for 3.5 hex head, and mistakenly believed Google took that on board, should have looked closer at the results. I thought it was too easy.

Chris Gunn

Thread: Motor wiring eyelets/crimps type?
21/11/2021 12:52:53

BB, Presumably you only have a few to do, so try annealing them, and then bend back the tabs, refit the new wire, and tap the tabs back down again with a punch, and then give them a final nip in the vice. You cannot get more original than that.

Chris Gunn

Thread: 3.5mm hex. head screws
21/11/2021 12:43:16

Buy M3 x 3mm Full Thread Hexagon Bolts (DIN 933) - Stainless Steel (A2) | Save 80% | 500,000+ Components | Accu®

Chris Gunn

Thread: How to read a micrometer
21/11/2021 12:39:14

Bill, thanks for the link to the Peter Marks info on mikes, a fascinating read, where did the morning go?

Chris Gunn

Thread: Fowell-Box Patent Engine
05/11/2021 21:02:14

Brian, you may well have sold the engine to Rob Bailey of Rushden, or it found its way into his hands via someone else. He then sold it on to Rahmi Koc.

We were chatting a couple of months back, and Rob mentioned this and sent me a few pictures of the engine. Rob arranged for me to visit Rahmi Koc some years back, and I took a picture of it in the museum.

If you would like these pictures i can email them if you PM me.

Chris Gunn

Thread: Chuck Guard
03/11/2021 12:45:56

My Bantam came with a flip down guard with no micro switch, I use it when drilling or turning with the coolant on to contain the spray. Usually I am working to a stop, so do not need to see with coolant on.

Chris Gunn

Thread: BCA belt replacement
31/10/2021 22:03:33

We used to use the green belting to make rings about 50mm diameter to hold the jaws of nail guns closed. We had special vee jaws made to attach to some hand shear blades so the material was cut square. So cutting the ends square is important. We had a small teflon coated blade to fit on the end of a soldering iron. The ends were heated, and slid off the blade and held together to make the joints. It needed practice to do it, and we got used to it. One problem for the hobbyist is that one does not get the chance to practice.

We made thousands of them, it was the cheapest and most effective way of keeping the jaws closed until the nail was driven through. The ring would stretch and then contract to hold the jaws shut. Each ring would cycle 7 or 8K times a day. This shows the joints will perform if the joint is made correctly.

Chris Gunn

Thread: Pulling cog off Albion Type C gearbox
30/10/2021 22:04:57

This looks a bit like a torque limiter we used to use many years ago, which had fibre friction discs between each side of the sprocket and the disc on the outside, and the hub on the inside between chainwheel and gearbox. However the ones we used also had a fine threaded locknut holding it all together. there appears to be a gap between the outer disc and the sprocket which could indicate that. The hub was located on the shaft with a parallel key, and grub screws through the hub.

Chris Gunn

Thread: A workholding question.
25/10/2021 11:54:39

Robin, now I have seen what you are trying to do, ie a disc with slots in, not a bobbin I imagined from your first pictures, then put a centre in a piece of bar to support the outside end, hold the bar in the chuck, and mill all the slots then part off and face. You will have to sacrifice a bit of bar in the process, but you should finish up with as many discs as you need all the same.

Chris Gunn

Thread: Locomotive boiler wrap
22/10/2021 21:28:21

Michael, plus 1 for plasticard templates.

I would not use aluminium, as you will have a job to get the paint to stick.

Steel would be my choice of material.

Chris Gunn

Thread: A workholding question.
22/10/2021 21:25:10

I may be missing something, but why not reverse the job in the chuck, hold the large diameter in the chuck, and support the little end with the centre, and machine the slots from the centre end to the recess in the middle or vice versa.

If I were making 4 hubs I might well start with a length of bar long enough for 4 parts plus parting off, machine the profiles of the bobbins then hold the whole length between chuck and centres, then machine the slots in the small diameters along the bar, so all will be the same, and then part off the hubs and face the ends.

Chris Gunn

Thread: Hello from East Northamptonshire
21/10/2021 21:59:41

Michael, welcome to the forum, I am in central Northamptonshire, and also secretary of the Rushden model steam enthusiasts group. We are 95% a road steam group. We do not have a clubroom as such, but do get together at rallies and during the winter months, subject to any Covid rules of course. We also can offer boiler testing when the time comes. PM me if you want any additional information.

Chris Gunn

Thread: Battery Electric Locomotive
17/10/2021 20:23:27

John, if you fancy a steam outline loco, here is a 5" G Boxhill I made many years ago. It uses all standard Boxhill parts, but the boiler shell and tanks are dummy, and under this there is a 12v motor and chain drive to one of the axles. The battery is carried in the driving trolley.

Chris Gunnboxhill-0004.jpg

Thread: Hermes. A Company in Total Confusion!
13/10/2021 10:54:11

I have to say my experience with Hermes recently is spot on, I have been decluttering via Ebay, and almost all of my sales have been shipped via Hermes, without any problems. I do book and pay for my shipment on line direct with Hermes, and the stuff is always picked up on time. I suspect that when the transaction passes from company to company, then problems can arise, and may not be of Hermes making.

Chris Gunn

Thread: Hornby on TV
13/10/2021 10:49:23

I watched too, and was a little disappointed, all a bit superficial, and of course no chance of seeing shots of the factory churning out their product range, I presume flights to China were not in the budget.

Chris Gunn

Thread: Recommend a grade of steel
21/09/2021 22:24:09

Rob, the same as Harry above, did you have a hydraulic lock to cause it to break?

Chris Gunn

Thread: Colchester Chipmaster 5x20. Hoping to buy.
18/09/2021 20:09:22

Dan, you could consider a Bantam as well.

Chris Gunn

Thread: A Couple of Questions about Pipe?
18/09/2021 19:55:13

JA, just seen your reference to working at Corby, did you work in the DR&TD? if so which department? did you know anyone in the Control Systems section?

Chris Gunn, DR&TD, 1969-73.

Thread: Apple recipes
15/09/2021 20:21:27

pgk pgk, thanks for the inspiration, ingredients plus clotted cream on order for tomorrow, report on taste test to follow.

Chris Gunn

Thread: Fixture plate ideas
15/09/2021 12:41:48

You could use thinner aluminium jig plate with a series of tapped holes in it for studs, much lighter and simpler to make, and for hobby use adequate for most things, and no need to machine tee slots.

Chris Gunn

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