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20 degrees vs 14.5 degrees pressure angle for gears

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JasonB06/12/2019 13:06:06
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If you did want to go the the expense of silver steel then 1m lengths are also a standard length just not from the usual ME suppliers, PGMS would be another option but a bit OTT

Like Andrew I went with bright bar though it took a couple of attempts to get a decent bit, first was bent and the second has quite a heavy spiral pattern down the outside more like you get on con cast bronze.

Stephen Meredith06/12/2019 13:30:20
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Thank you both for the replies.

Looks like college supplies at a show, and get a good bit, and at least see it before buying.

Hopefully, some new old stock that's straight.

I think this engine's a big step up from my previous model this may not be my last question.

Jason can probably vouch for that as you have helped me a lot in the past building the Minnie,

I owe you many pints.

steve.

Martin Rock-Evans06/12/2019 18:28:32
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I brought myself a 24" length of 1" precision ground EN1A from College Engineering Supply. I guess it is a little expensive, but on the other hand, in comparison to other parts it's not too much, and I knew it would fit well when the bearings were reamed. I didn't put bronze bushes into the hubs, so they are cast iron on the steel shaft, but I do have bronze bushes in the final drive tube, mostly because that was fairly easy to do with the castings I have from Bridport Foundry.

Stephen Meredith10/12/2019 20:22:13
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Hello all.

Another small question on my 3" drawings the hole on top of the smokebox tube says 7/8 but the chimney base castings bore says 1"-7/8 is the hole on the smokebox wrong. Attached photo of the drawing if i can manage to do it. Should they both be 1 -7/8"

Stephen Meredith11/12/2019 13:39:25
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Initially had trouble with the photo, finally found a way to post it the dimension I'm struggling with is the one marked in red, is this meant to be 1 - 7/8" not just 7/8" I know the drawing is to scale and it certainly bigger than 7/8" .

Stephen Meredith14/07/2020 08:59:16
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A question about your gears, did you use the cast blanks produced by Bridport for your 2nd motion gears?

Martin Rock-Evans14/07/2020 14:16:37
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Stephen, yes, I used the full set of castings from Bridport for the drive gear chain.

Stephen Meredith02/08/2020 12:32:07
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Hello again is there a reason the 2nd motion shaft fast gear has such a large boss. The drawing says 1-1/4" was wondering up the key caused problems and its been sized up from when my drawings were produced.

Any help greatly appreciated

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