Author Topic: Scale gearbox (or how I leaned to love aluminium)  (Read 248 times)

Offline Steve Crow

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Scale gearbox (or how I leaned to love aluminium)
« on: July 15, 2021, 07:22:42 PM »
This is a housing for a 1/12 scale Hewland gearbox to mate with an engine I'm making.



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.



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.



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.



Steve

Offline Steve Crow

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Re: Scale gearbox (or how I leaned to love aluminium)
« Reply #1 on: July 15, 2021, 07:48:16 PM »

"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".

Online RReid

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Re: Scale gearbox (or how I leaned to love aluminium)
« Reply #2 on: July 15, 2021, 08:29:41 PM »
That looks great, Steve! I'll be looking forward to seeing your further progress.  :ThumbsUp:
Regards,
Ron

Offline Vixen

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Re: Scale gearbox (or how I leaned to love aluminium)
« Reply #3 on: July 15, 2021, 09:40:09 PM »
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
It is the journey that matters, not the destination