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Making parallel motion links for Stuart Beam engine

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Lee Wallis11/04/2020 16:44:27
3 forum posts

Can anyone help me with a link to a video or just advice on how to fabricate the parallel motion links for the Stuart beam engine? How does one shape the part to get the "fishbelly" features. For that matter, how do you machine the basic shaft profile?

Thanks in advance for your help,

Lee

Novice Machinist

JasonB11/04/2020 16:54:11
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25215 forum posts
3105 photos
1 articles

Have a read ofmy couple of posts in this thread

I would put a very small ctr drill hole in one end of the material then hold in the 4-jaw with tailstock support to first turn a parallel section and then shape as above. when done drill and ream the two holes and finally use filing buttons to round the ends. The holes can be drilled before turning and the button scribed around then that line acts as a guide where to stop turning.

Edited By JasonB on 11/04/2020 16:55:37

Mick B111/04/2020 17:10:38
2444 forum posts
139 photos

I just used bits of 1/4" x 1/8" flat BDMS strip with a radius filed on the ends. But I was short of time in those days. laugh

Edited By Mick B1 on 11/04/2020 17:14:00

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