Model Engine Maker
Supporting => Engine Ancillaries => Topic started by: Steve Crow on July 15, 2021, 07:22:42 PM
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This is a housing for a 1/12 scale Hewland gearbox to mate with an engine I'm making.
(https://www.model-engineer.co.uk/sites/7/images/member_albums/163849/896649.jpg)
This is my first attempt at machining aluminium. I've drilled and tapped it in the past but that's it.
I really disliked the stuff and thought it was the Devil's metal but I wanted to keep this light as it's hanging off the rear of the engine so I bit the bullet (billet?).
It all went so much better than expected and I got a great finish.
(https://www.model-engineer.co.uk/sites/7/images/member_albums/163849/896650.jpg)
I've rubbed down flat external areas but all curved and internal bits are straight from the lathe. It tapped nicely as well with a drop of WD40 which was just as well as I had 33 hole to do, nearly all M1.2.
(https://www.model-engineer.co.uk/sites/7/images/member_albums/163849/896651.jpg)
It was made from a scrap of 1/12" x 5/8" bar 30mm long. It weighed 52g originally but it is 10.6g now.
I've just got to make a few more parts then I can drop in my differential.
(https://www.model-engineer.co.uk/sites/7/images/member_albums/163849/892992.jpg)
Steve
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"It was made from a scrap of 1/12" x 5/8" bar 30mm long. It weighed 52g originally but it is 10.6g now."
Sorry, that should read 1 1/2".
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That looks great, Steve! I'll be looking forward to seeing your further progress. :ThumbsUp:
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This Hewland gearbox will look great behind your Cosworth DFV. :popcorn:
Hard grades of aluminium alloy (6064 etc) are a joy to machine. :ThumbsUp: :ThumbsUp: Soft (pure-ish) aluminium can be a right pain. :toilet_claw:
Mike