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Member postings for Ian Hewson

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

Thread: lathe to cut 26tpi
19/02/2019 18:38:55

My myford 254s has 26 tpi as standard in the gearbox.

Thread: Talktalk new web site
09/02/2019 12:41:47

I use gmail lite on my iPhone, iPad and Mac, seem’s ok.

Thread: Where have all the C/S Copper rivets gone?
02/02/2019 17:46:13

You don’t even need a rivet, a piece of whatever type of material you are using put in to the countersunk hole can be hammered in using a ball pein hammer to close it into the hole.

The try squares I made 60 years ago and still use were made this way, no sign of the joint or rivets showing.

Thread: Jason's Firefly .46 Build
31/01/2019 09:27:30

Hi Danny

Adrian’s model aero engines site also mentions very thorough cleaning after diamond lapping, but not as far as ultrasonics.

Link is useful for piston rings, but Firefly is not designed for use with one.

Ian

Thread: In search of Peter Rawlinson
31/01/2019 09:10:58

A great and respected writer, he will be sadly missed, his family should be proud of him as I am sure they are.

Condolences

Ian Hewson

Thread: Jason's Firefly .46 Build
25/01/2019 09:04:59

Hi Geoff, thanks for the info on the piston lapping, I used the method described on AdriansModelAeroEngines.com site where he advises lapping the barrel to a slight taper fit, just nipping at the top, similar to your findings.

My engine will probably never fly, but I do like to do the work to the best of my ability even so.

Appreciate the help you get on here.

Ian

24/01/2019 18:58:46

Thanks for that Jason, just looking ahead, got the engine built up to the backplate level, going to do the crank and piston next. Lapped the cylinder with diamond paste from Arc, came up nicely.

Interesting build, makes a change from steam models.

Think I have realised what the nipple on the silencer is for, pressurising the fuel tank to feed the carb, no need for the fuel tubes to the mixing chamber in the backplate?

24/01/2019 18:36:01

Another question, do you use any gaskets or sealants, for the cylinder head, engine backplate or block to cylinder?

Thread: What Did You Do Today 2019
16/01/2019 23:06:18

Neil, you should be an archer with all the strings you have for your bow🤗

Thread: Jason's Firefly .46 Build
05/01/2019 21:00:05

Hi Jason

Thanks for your prompt reply, appreciated, so the holes on the liner are the critical ones, and should not be restricted in diameter by the holes in the block when it is fitted?

The 10.5mm exhaust hole was the one that was confusing me as it seems to restrict the port in the liner.

Just measured the plan, and I can now see that the 14.35mm is due to the curvature of the cylinder, didn’t want to bu**er up the block on the last cut.

Ian

05/01/2019 20:18:30

A question about the port dimensions, the cylinder block exhaust port is shown as 10.5mm x 5.5mm, whilst the cylinder liner port is shown as 15.285mm x 4.96mm.

How critical are these dimension as the are shown to three places of decimals?

I would have thought that the liner would have been the important dimension for the exhaust, is it to do with back pressure as in a car engine?

As I mentioned before, I have not had any experience with 2 stroke engines.

Thread: Busted tap & brute force
03/01/2019 15:17:20

Bought a few cheap carbide drills at one of the regular stalls at the Midlands Show, tried them on an old hss tool using slowish speeds and feed on the Fobco. They cut without any problems, wish I had bought a few more and had some years ago for jobs such as the above.

Edited By Ian Hewson on 03/01/2019 15:17:57

Edited By Ian Hewson on 03/01/2019 15:18:35

Thread: clock key manufacture
31/12/2018 09:13:06

Used to make box spanner’s that way out of conduit, opened up the end of a piece of 1 inch conduit with the ball end of the hammer and then closed it round a 3/4 inch conduit bush.

You could make any length spanner up to 12 foot that way.

I know you should not hammer two hammers together, but we got away with it, but it is not to be recommended.

Thread: Insulation tester - some guidance please
20/12/2018 15:16:48

In the late 50s as an apprentice in the YEB meter test room it was a joke to get the lad to hold the wires of the 1000volt megger, but they could not understand why I could hold on as they wound.

So long as I held tightly I only got a tickle, laugh on them.

It was a different story with the later electronic version though, I could not hold that.

Thread: headstock oil
11/12/2018 19:04:46

My manual says febris k68

Edited By Ian Hewson on 11/12/2018 19:05:18

Thread: Interests other than Model Engineering
03/12/2018 19:43:01

And a lot more did!!!!!

Thread: Anyone bought a new Myford
27/11/2018 23:29:57

What’s that got to do with getting a bargain Mick?🤔

27/11/2018 22:10:17

Some people have all the luck David 🤢

26/11/2018 21:49:40

Wouldn’t change my refurbished by Myford 254s, lot of wi**y waving goes on about myfords.

Thread: Jason's Firefly .46 Build
24/11/2018 19:52:28

Thanks Jason, just noticed the two different threads whilst looking for the best supplier.

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