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1
From Plans / Re: Mount Trapezium
« Last post by crueby on Today at 02:39:26 PM »
Personal preference, but I like to drill the screw holes in the side tabs on the strap  to hold it together, to not depend on the solder alone. I'd  do that after cutting and trueing the cut faces. The screws give extra strength for the other shaping steps.
2
From Plans / Re: Mount Trapezium
« Last post by redhouseluv on Today at 02:28:52 PM »
I'm probably being over-cautions by the instructions/diagram relating to the eccentric strap. The diagram shows 0.563" from centre to bottom edge and 0.668" from centre to end of spigot. The wording says cut the strap in half and solder together, but will that work?

I presume the 0.563" from centre to edge is the outside diameter and can be made once the strap is on the rotary table and the centre to the spigot can be made reducing the spigot length?



3
From Plans / Re: Mount Trapezium
« Last post by redhouseluv on Today at 02:14:46 PM »
Quote from: crueby on Today at 02:12:02 PM
Nice!  How is it held in place, set screw in the boss?   :popcorn:

Good point ...........not quite finished, 2 x 6BA set screws in the boss
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From Plans / Re: Mount Trapezium
« Last post by crueby on Today at 02:12:02 PM »
Nice!  How is it held in place, set screw in the boss?   :popcorn:
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From Plans / Re: Mount Trapezium
« Last post by redhouseluv on Today at 01:31:36 PM »
Finished the eccentric and it's not looking too bad; moving onto the strap next then the bent eccentric rod
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From Plans / Re: Mount Trapezium
« Last post by redhouseluv on Today at 11:55:16 AM »
 :ThumbsUp: thought so, but best to check  :)
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From Plans / Re: Mount Trapezium
« Last post by Jasonb on Today at 11:54:21 AM »
I doubt it matters, go with what looks pleasing to your eye.
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From Plans / Re: Mount Trapezium
« Last post by redhouseluv on Today at 11:39:36 AM »
Eccentric boss diameter question

Mr Keats is back out for the second time this year and I'm machining the eccentric. Does the thickness (outer diamter) of the boss matter? It's about 0.015" thicker than 0.675" as specified, but it looks right i.e the edge of the boss meets the outer diameter of the eccentric (see pic)
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From Plans / Re: Mount Trapezium
« Last post by redhouseluv on May 12, 2025, 10:30:50 PM »
Thanks Per, :ThumbsUp:

Also on larger, slower rotating engines the governors hardly look like they are doing anything (are they?), whereas on the smaller engines they are flying? I appreciate the speed/energy will make the balls spin out more and vice versa

Lot's of questions today, always learning new things on the forum!  :)
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Vehicles & Models / Re: a newbie's take on the A3 switcher
« Last post by Kim on May 12, 2025, 10:08:49 PM »
That should work too.  It just seemed like more work to me to turn it down to 2" when every side is being machined anyway, but that was me.  I have no doubt that will be quite successful for you!

Keep us posted...

Kim
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