rick-b
Aluminum
- Joined
- Jan 1, 2013
- Location
- Queensland
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Rick,
What about a precise hole directly underneath one of the teeth?
You could use a gage pin to locate the radius of a single gear tooth (assuming you can buy/make a pin close to size) once you flip the gear.
Or pick up one of the pockets previously milled through the gear. (think a male mandrel, a few 0.001"s smaller than the pocket)
Or just machine in any type of locator you can, into the gear. Since it for you son's use, you can pretty much do anything you want...
Make the fixture two pieces and keep the chainring bolted to the center piece that keys into the center of the flat part of the fixture. Unbolt the center with the chainring attached and flip it. That or give up two of the bolt holes for pins but the first idea is definitely going to be more repeatable. Are you going to chamfer the windows or are you just doing profile work on the teeth?
Yes, I'm looking to chamfer the windows and profiling the teeth.
I assume that is waterjet cut? Is it oversized on the teeth or are you hoping it is accurate enough to locate off the current part before starting?
Rick,
What about a precise hole directly underneath one of the teeth?
You could use a gage pin to locate the radius of a single gear tooth (assuming you can buy/make a pin close to size) once you flip the gear.
Or pick up one of the pockets previously milled through the gear. (think a male mandrel, a few 0.001"s smaller than the pocket)
Or just machine in any type of locator you can, into the gear. Since it for you son's use, you can pretty much do anything you want...
I was assuming he was going to chamfer the windows so was trying to avoid adding something inside them for locating purposes.
what am I missing? Why can't you just pin off one of the bolt holes?
What bike is your son dragracing ? [emoji2957]
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I am about to machine some 530 blanks for my own dragbike. These are sprocket blanks and I don't really care about the rotation/indexing of sprocket. I just clamp it down and machine the center and holes and pockets.
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regarding pinning off bolt holes, ive made hundreds of sprockets that way. we made the bolt holes a snug fit to the fixture bolts, then bench reamed the sprocket holes for more clearance. 2 bolts locate the sprocket. like a poor mans dowel setup.
or am I just over thinking this?
Just a simple Harley Sportster dragbike.No, I was looking at doing it in a two part job first cut the centre hole, teeth and the bolt holes then send it out to be hard anodised put it back in the fixture finish the pattern and chamfer the lot.
Couldn't pick up on the pocket's he want a few different patterns.
Correct.
Not sure that will work.
It's a turbo funny bike.
The chain is 630p, blanks would be good but they are impossible to get here and when you get them the cost is ridicules.What is your drag bike?
regarding pinning off bolt holes, ive made hundreds of sprockets that way. we made the bolt holes a snug fit to the fixture bolts, then bench reamed the sprocket holes for more clearance. 2 bolts locate the sprocket. like a poor mans dowel setup.
OK, I didn't think it would work. This may be my lack of experience working with fixtures but with 6 bolt holes in the sprocket how do I know for sure after removing the sprocket for anodising that it go's back on the fixture in the same place so I can finish the job? or am I just over thinking this?
Just a simple Harley Sportster dragbike.
I love turbo funnybikes. Good they are making a comeback.
I would think some fitter bolt holes would be enough to hit it fairly accurate. If it just to contrast cut it after anodising it's more than ok.
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That's awesome. I love everything about dragbikes.The son wanted a Prostock bike I wanted a nitro bike so we met in the middle and I'm building him a turbo funny bike which we can run in Topbike here in Australia.
I thought I may have been over thinking it I seem to do that a lot when it comes to fixtures. I think it comes from the fact I have had a bit of trouble in the past flipping parts. I suppose this an inherent problem of being self-taught.
Thanks, everyone I now have a few ideas that I'm going to try.
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