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Home✈️Aircraft🚁HelicopterGasser Model RC HelicoptersOther News  Custom Main Gear... I think...
03-26-2017 11:03 PM  3 years ago
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RM3

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Killeen, Texas - USA

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Custom Main Gear... I think...
Finally got some spare time to turn out the tooling I needed to cut a main gear for the radikal.... wich required a custom arbor cut to hold the gear blank by the 6 total each at 3mm mounting holes and the center which is a big 1.026" hole.
the gear is made from black Delrin, the original is the white one we are all familiar with.

Turned out pretty good. it could be better though. My hope is to come up with a better machining routine that is both efficient and more accurate in which there are as few changes to fixuring as possible. I went from the mill, then to the lathe, then back to the mill... which results in tiny radial roun-out of about 0.005" and axial runout of about 0.009"... my goal is no more than 0.001" overall (over-kill really but thats my standard for gears). to do that will require going from one machine to the other with no "re-work".

the teeth were cut on a CNC but the gear blank was manually cut on a lathe. The issue I have is that the lathe I have or the chuck rather is too small to hold the raw stock which is 4 inches in diameter (the chuck can only hold accurately a 3.75" diameter stock)... so still trying to figure out how to remedy that issue.

showing a preference will only get you into trouble, 90% of everything is crap...
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03-27-2017 02:19 PM  3 years ago
OuttaControl

rrVeteran

Springfield, Missouri -United states

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Gear
I NEED ONE!!!!!!!
Mine fall down, went BOOM!!
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03-28-2017 02:12 AM  3 years ago
rcglo1

rrApprentice

Broadford, Victoria, Australia

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g20 gasser parts
are you selling the gears?
http://www.youtube.com/user/rcglo1?feature=mhee#p/a/u/0/tjylNcHuqX8
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03-28-2017 03:57 AM  3 years ago
ssrobzoom

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Tn

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so still trying to figure out how to remedy that issue.
Why not get a bigger chuck or reversible chuck jaws?
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03-28-2017 02:02 PM  3 years ago
RM3

rrElite Veteran

Killeen, Texas - USA

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SSROBZOOM-
...cause Im using a Sherline lathe, great for accuracy (its in CNC mode), not so much on capacity. therefore a larger chuck simply doesnt fit. and really is impractical on a lathe this small, a larger chuck would not clear the bed ways.

There is a way around the issue, but it involves an extra step. Or buy a bigger lathe (but at the moment I dont make enough of anything to justify the cost of even a medium sized used manual lathe)

RCGLO1-
As for selling them, I may, just on a very limited basis (I tried that with the 3 shoe clutch 2 years ago and the demand wasn't there).

just not ready for that quite yet.

Im also working on the tail drive gear which the stock unit has had a history of being warped from the factory (we've all seen that wobble).

after that my plan is to tackle the smaller tail drive bevel and spur gears (which are a perfect match for the tooling size I have on hand)
showing a preference will only get you into trouble, 90% of everything is crap...
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03-28-2017 04:56 PM  3 years ago
Pistol Pete

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Seffner, FL

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Nice!

FYI
Tail drive gear same as main gear to Swift 16.
~~Enjoying the hobby one flight at a time~~
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04-07-2017 12:09 PM  3 years ago
rcglo1

rrApprentice

Broadford, Victoria, Australia

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nice gear!
thanks rm3 i will wait and if you do later on i will put my hand up for one,
http://www.youtube.com/user/rcglo1?feature=mhee#p/a/u/0/tjylNcHuqX8
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