Engineering Problem

[geoff]

OK, here is the problem...I need to turn the drive from an S28-150 Magmotor through 90 degrees, I need to safely deal with both the max torque of around 13.5Nm and shaft speed of around 6000 rpm, my original idea was to use a set of induction hardened Mod. 2.5 straight cut (Gleason System) bevel gears but I have been warned that although it would work, that it could be very noisy. Would I be better off using a set of spiral cut bevel gears?
Or can anyone think of a better soloution.
Thanks

Geoff.

(Oh yes, one other thing, it needs to be as light as possible!!)

[stu]

Engineering Problem

Geoff you got the money, why dont you just buy one of those funny name teams gear boxes specialy made for Mags. Team Wy thingy. LOL! And its light.

Mr Stu

[aliboy]

Engineering Problem

http://www.teamwhyachi.com/Twm3R.htmhttp://www.teamwhyachi.com/Twm3R.htm
Something like that Geoff ?

[stu]

Engineering Problem

Only 1.8kg there Geoff. LOL!

Mr Stu

Ok 1.81437kg!

[geoff]

Engineering Problem

Been there, seen them! Thats the sort of thing, but at 1.8Kg theyre WAY too heavy! also they have a 2:1 ratio I need 1:1 :sad:

(Plus at the moment $345 + shipping is just not on! :sad: )

[stu]

Engineering Problem

Having a mag motor in the first place is not on! LOL!

Mr Stu

[robotic_ants]

Engineering Problem

Nah, having a Mag motor in a feather is not on! But as regards to you problem just dont do it in the first place hehehe! :P

Chris

[psychostorm]

Engineering Problem

Apparently they do customisations too.

http://www.teamwhyachi.com/botshop.htm

[geoff]

Engineering Problem

Does anyone else think a magmotor is overkill? I know I do.

So you havnt met our Astroflight powered featherweight spinner or our Lynch powered heavyweight spinner yet have you Ceri?!!

Anyway, this one is for the girls to play with!:wink:

But seriously for a moment, anyone got thoughts on the original problem?

[robotic_ants]

Engineering Problem

Mag Motor is over kill but whos going to stop him its his bot and theres no rules against it so all we can do it beg and plead :sad:. Vortex proved that they are OTT for british featherweights even Ti clad U.S. 30lbs still struggle against Mag powered weapons.

quote:

Anyway, this one is for the girls to play with!I think that scares me more than the thought of using a Mag motor in the first place.

Seriously though all I can think of is find out what gears Team Whyachi use, and build you own 90 degree gear box as light weight as possible.

Chris - Coalition Against Mag Motors In Featherweights

[tim_jones]

Engineering Problem

I wouldnt worry about the noise, it is half the fun after all

Regards

Tim

[maddox]

Engineering Problem

Geoff, I can make you that gearbox. And not for £25 labourcharge an hour. Contact me.

[james...venom]

Engineering Problem

Trilibium uses a mod 2 beval gear and its well niosy!. why not go for it and enclose it in a 1mm ali box, fill it with grease and it should be fine. as long as the ali isnt suppoting the bearings the shafts run in.

[Mouldy]

Engineering Problem

I would of thought helical gears were another option? Not sure on there effeciancy etc but itd do the job. As James said if you make an enclosed gearbox it should block out a fair bit of noise and keep the gears swarf-free

[mark_m]

Engineering Problem

The problem with bevel gears and in particular spiral cut bevel gears is the huge lateral loads they put onto the supports. This requires a chunky gearbox with heavy bearings. If you are planning to use this gearbox for a spinner, the tough supports and big bearings are what youd want anyway.
If youre using it for anything else though I can think of some lighter alternatives Only thing is they would take up more space and are probably not as robust.
1. Universal joints. you would probably need at least three joints in series, with bearings supporting the intermediate shafts.
2. flexible shaft:http://www.lara.com/cgi-bin/store/commerce.cgi?oc=WI-FDhttp://www.lara.com/cgi-bin/store/commerce.cgi?oc=WI-FD
They would probably take the torque and might even allow a bit of cushioning to pretect the mag from impact torques. You might have a problem with them whipping so youd have to support them along their length. This would take space but not much weight.
3. polyurethane belts twisting through 90. This could work well and be light. 8mm belt around 80mm pulleys should be able take the torque.