Poppin Engine build.

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ian_in_the_midlands:
Slow progress today.
The aluminium mandrel (should I be calling it an arbour?) was used.
Both flywheels were turned to final diameter and the centre was bored out.
I had problems with chatter. I suspect this was caused by flex in the soft aluminium, and maybe a blunt tool.
Then the centres for the 4 spoke holes were marked and centre drilled.
The tool marks were polished out before drilling out the holes.
I started on the pillar drill, but it was apparent that I was going to get a grab, so I fitted the 4 jaw chuck and started boring on the lathe.
Near disaster - I did get a grab, and the wheel was pulled from the chuck. Luckily the flywheel was not in too bad a shape. Some small marks around the circumference that I will be able to turn out without losing much of the diameter.
The wheel re-chucked, I bored again, this time going up in smaller increments. The first two holes went okay.
It is getting late now, so stopped whilst still ahead.

Stilldrillin:
I like the way you made the cam, Ian! :clap: :clap:

It's all shaping up, nicely........ :headbang:

--- Quote from: ian_in_the_midlands on November 29, 2014, 01:12:43 PM ---Any suggestions for a better method I could have used?

--- End quote ---

If it works for you, and the part is correct. That's the best method........ :thumbup:

David D

vtsteam:
I've been following Ian, and you've been doing very nice work while learning.

One question, did you stone a tiny flat on your drill tip lips before trying to drill the brass flywheels? Otherwise brass does really tend to grab.

Kind of hard to explain what I mean by "a flat" , but if you place the drill vertical tip down on a table, the direction of the flat would be parallel with the axis of the drill -- vertical. And it is very slight amount of stoning -- almost invisible.

I usually lay the stone flat on the bench, hook one lip of the drill bit over the edge on top, with the drill bit running parallel with the edge of the stone, and give it a swipe along the length of the stone. It should be a fine stone. Then do the other lip.

ian_in_the_midlands:
No I haven't.
Somebody told me that that drills for brass are ground differently.
My previous attempts of grinding drills have been hopeless, so I thought instead I would just use brand new drills.

If it is simply grinding a flat I would hope I could do that.
I will investigate.

Thanks.

Stilldrillin:
Have a look here, Ian.

http://users.bart.nl/users/summer/16mmngm/Articles_htms/ColinBinnie/DrillSharpening.htm

David D

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