Supporting > Engine Ancillaries
Single Pass Bevel Gears
Ian S C:
Captain Jerry, just what I'm looking for, thats great. For your 1/2" gear how many teeth?
Ian S C
Captain Jerry:
--- Quote from: Bogstandard on November 12, 2012, 08:57:29 AM ---You have proved that in this little game we play, lots of times we don't require the exact precision of correctly made gears, but something close will usually achieve what we want.
Nice one :NotWorthy:
John
--- End quote ---
It's a good thing that absolute precision is not required. We can build little engines that run quite well without rings. We can run flywheels that have not been dynamically balanced. We can be satisfied with fits that would be rejected by any careful inspector and we can do it with cheap equipment and fading vision. Hobbed gears with faceted faces are another good example of a good compromise as are bevel gears cut with constant depth/height teeth. So are Browne & Sharpe precision gear cutters that cover a range of gear teeth. The single pass method could be improved by the use of precision gear cutters but that doesn't compare with the pleasure of a shop made solution.
--- Quote from: Jo on November 12, 2012, 09:24:04 AM ---I made similair tapered bevels for my Grasshopper, they work adequatley and allow the "balls to fly" but they don't have to actually operate the governor.
Jo
--- End quote ---
What is your concern? Do you think the gears are not smooth enough for precision speed control or is it the strength that worries you? A governor gear set should not need to transmit much torque.
--- Quote from: Ian S C on November 12, 2012, 12:56:01 PM ---Captain Jerry, just what I'm looking for, thats great. For your 1/2" gear how many teeth?
Ian S C
--- End quote ---
The gears that I cut have 12 teeth. It works out nicely with 6 turns on my 72:1 RT.
Jo:
--- Quote from: Captain Jerry on November 12, 2012, 02:47:05 PM ---
--- Quote from: Jo on November 12, 2012, 09:24:04 AM ---I made similair tapered bevels for my Grasshopper, they work adequatley and allow the "balls to fly" but they don't have to actually operate the governor.
Jo
--- End quote ---
What is your concern? Do you think the gears are not smooth enough for precision speed control or is it the strength that worries you? A governor gear set should not need to transmit much torque.
--- End quote ---
No concern, just stating the fact mine don't have to do any work.
Jo
Captain Jerry:
Oh. I thought you were saying that they couldn't do any work.
Ken I:
Jerry,
The engineer part of my brain that knows exactly how and why gears should be (I worked briefly for ZF) recoils.
The hobbyist in me says what the heck - if it works ....
In my other hobby - racing slotcars - we run plain gears and pinnions with the shafts out of parallel (corrcect orientation) by 20? - otherwise the motor fouls the axle - something the engineer in me says simply just shouldn't work - but it does and its been done like that for a long time.
I have often though of cutting a gear just like you suggested but have never tried it - will definitely give it a whirl next time the occasion arrises.
Ken
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version