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Member postings for Mark Smith 3

Here is a list of all the postings Mark Smith 3 has made in our forums. Click on a thread name to jump to the thread.

Thread: 3 way toolpost
27/05/2022 11:26:40

Thank you for looking into it. I managed to re-tell the gist of it and people are responding.


27/05/2022 11:14:35

I agree, I haven't stabbed myself on my four way yet either, but as you said I too like the clearance it provides. That's what attracted me to it.


27/05/2022 09:45:39

Thank you Michael I'll do that.

As to the boring bar problem Lammas says to make more than one. The other is upside down with respect to the first.

27/05/2022 09:34:05

The gist of the post is I made a 3 way tool post from a design I found in a ME magazine No. 299 December 2020. It is a very good design as it doesn't have sharp bits pointing at the operator. Also I want to know if anyone else a has made one and what they think of it.

I would have liked to add a photo but I can't remember how.

27/05/2022 09:27:14

It appears it has been deleted

27/05/2022 09:22:24

The third one down seems to have the correct one. I'll check.

27/05/2022 09:22:22

The third one down seems to have the correct one. I'll check.

27/05/2022 09:06:04

Funny, as I said I don't know how that happened I only posted one.

27/05/2022 08:50:04

Sorry I'm not sure how that happened.

Thread: Hot air and stirling engines
20/03/2017 17:23:42
No I sold it as I had to go to smaller digs. Had no room for it. Still trying to upload photo can't seem to find instructions. The motor above looks good.
19/03/2017 17:14:56
No I have a Portass about the size of a myford 10. It's old but in good condition. Chucks are new. I also have a small mill good for what I need
18/03/2017 20:53:23
Thanks Ian I'll do that
18/03/2017 01:13:16
I want to upload a pic of my latest engine. Forgotten how

Edited By Mark Smith 3 on 18/03/2017 01:14:10

30/12/2015 23:16:37

No, not now, I chucked a lot it out in despair, but to be fair those early engines either did not work well or so poorly made I was a bit ashamed of them. I try to do much better work now.

I have a small mill and just learning how to drill accurately positioned holes in a cylinder flange. Real engineers will laugh as they would have learnt that very early on, but we have to start somewhere.

30/12/2015 03:42:21

Hi All, it's been fiveyears since the Canterbury earth quakes and I am finally settled in a new(well, not new) home. My house was severly damaged and had to be rebuilt. My son decided to buy my rebuilt house and I have bought a 1970s house that suits me. but, to get to the point I now have a workshop again with an old but perfect Portass lathe, drill press, milling machine, and a metal cutting band saw...happy as.

As many of you know I built engines for my Grandsons and their cousin. But while testing the engine I built for my youngest Grandson I had a terrible accident. I thought the flame had gone out in the alcohol burner and refuelled it. As you know the alcahol flame is sometimes invisible and that happened to me. As I refuelled the whole thing ignited and seriously burnt my left hand, which took many weeks of healing. All is well now, but a lesson learnt.

As a result I withdrew the engines I had made to redesign them to run on Mamod fuel tablets instead. I designed a firebox that works well. I did not want the same thing to happen to one of them.

I look foreward to your comments or condemnation for my stupidity, but hopefully I can rejoin the thread with things I am up to.

Ian, now I am settled I would like to come out see you and catch up.

07/07/2011 06:44:09
Hi Ian that is an interesting motor you have there, bell crank displacer drive I assume from the pic. I haven't built anything since the quake just couldn't get interested, but I have begun assembling tubes and other bits for a project that is a Beta design using half a Ross yoke. You just have to extend the rocker arm to match the top of the Ross yoke to drive either the displacer or the piston. I hope to come out for a visit maybe in the spring when things warm up and the earthquakes slow down a bit.
27/06/2011 09:44:35
I have made several engines now most have been horizontal engines. If the displacer is light enough, as it should be, there is no need to place rollers or bearings to support it.. The bailey Engine which had such rollers was a very large engine and could justify such a modification; model engines, on the other hand, do not need it as the shaft of the displacer, if 3/66", should support the displacer without problems.

Edited By Mark Smith 3 on 27/06/2011 09:46:37

27/04/2011 19:33:21
I found sewing machine oil works well, after all they sound like sewing machines.
26/04/2011 09:47:51
Thankyou for your prompt reply, David. The great thing about stirling engines is simplicity. They can be constructed from junk or engineered to a high level of excellence, they are a suitable starting point for tyro engineers wanting to go on to greater things like locomotives and traction engines. Anyone wanting to see how to build these engines with any degree of skill only has to look at articles and books by people like Andy Ross and Roy Darlington to see what is possible with these fascinating machines.

Edited By Mark Smith 3 on 26/04/2011 09:49:25

26/04/2011 08:18:16
Given the number of people who have read or are following this thread, I was a little surprised to note that the Survey in the latest issue, under the tile "Which of the following are you interested in reading about in Model Engineer", does not mention Stirling or hotair engines.
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