The Craftmans Shop > New from Old
Boxford back from the dead
awemawson:
Yes but only a few thou
Detailed here:
http://madmodder.net/index.php/topic,9334.0.html
kayzed1:
what size of CI do you need for the gears?
WeldingRod:
You can broach blind, but you have to keep pulling the tool out as n breaking off the chips with a punch. That's how I made the cams for my D-1 headstock mod.
I might still have the backward one ;-)
Yep!
Sent from my SAMSUNG-SM-G891A using Tapatalk
AdeV:
--- Quote from: kayzed1 on June 24, 2019, 03:59:34 PM ---what size of CI do you need for the gears?
--- End quote ---
The OD of the large gear is 4", the spur gear is about 1.6" ish (I have the exact measurements, but not here). I was going to buy a couple of slices of 5" CI for the big gear (4.5" doesn't seem to be available), and a 2" bar about 6" long for the spur/shaft. The main thing that's stopped me is I'm not sure how to bore that large a piece with sufficient accuracy... the original looks to be a casting, with both ends machined about 2" in, with the centre left "as cast", with a smaller diameter. I don't know if they cast it as a gear & then tidied the teeth up, or as a blank & fully machined the teeth into it.
The large gear is about 0.580" thick, although I assume that's not a particularly critical dimension.
Pete.:
If you're making a 4.5" gear from raw cast bar stock you'll need to start with a 5" bar anyway. The outer crust can be quite thick and you won't want to be cutting teeth in it.
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