Can I do this; Aluminum on Steel?
Can I do this; Aluminum on Steel?
(OP)
I'm working on a developmental project on which I cannot give too many details but here's the situation: I have a Stub shaft which can be seen in the attached illustration. This shaft is made from a high-strength steel (exact alloy unknown) and is driving an accessory shaft. It's transmitting up to 120HP @ 7,000rpm for short periods of time (10-15 seconds) but is transmitting between 50-70% of that most of the time...
Space limitations are very restricting and the stub shaft cannot be modified. -- As you'll see in the image, the Stub shaft has a 1:10 taper as does the mating ACC shaft. Up until now, we've tested with a steel Accessory shaft which has worked fine but is way too heavy to be practical.
What I want to do is make this Accessory shaft out of aluminum but I am weary of pressing an Aluminum Accessory shaft (female) onto a Steel Drive shaft (male)... Can I do this? What problems might this cause?
There is no key, only the friction between the tapered surfaces will transmit the load.
There is little-to-no cantilever forces on the joint, as all load is transmitted rotational about the shaft axis. There little shock loading as well, it is mostly smooth transmission.
What's your input?
Any info or link will be greatly appreciated.
Thanks,
VS
Space limitations are very restricting and the stub shaft cannot be modified. -- As you'll see in the image, the Stub shaft has a 1:10 taper as does the mating ACC shaft. Up until now, we've tested with a steel Accessory shaft which has worked fine but is way too heavy to be practical.
What I want to do is make this Accessory shaft out of aluminum but I am weary of pressing an Aluminum Accessory shaft (female) onto a Steel Drive shaft (male)... Can I do this? What problems might this cause?
There is no key, only the friction between the tapered surfaces will transmit the load.
There is little-to-no cantilever forces on the joint, as all load is transmitted rotational about the shaft axis. There little shock loading as well, it is mostly smooth transmission.
What's your input?
Any info or link will be greatly appreciated.
Thanks,
VS





RE: Can I do this; Aluminum on Steel?
A 1:10 taper is rather a lot, do you do this for disassembly?
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Can I do this; Aluminum on Steel?
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: Can I do this; Aluminum on Steel?
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RE: Can I do this; Aluminum on Steel?
The taper is fairly coarse.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Can I do this; Aluminum on Steel?
Mike Halloran
Pembroke Pines, FL, USA
RE: Can I do this; Aluminum on Steel?
Cars have had aluminium driveshafts for donkey's years, I'm not saying that aluminium is the ideal material for a driveshaft, but it can certainly be made to work.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Can I do this; Aluminum on Steel?
>>> way too heavy to be practical <<< We have no measurements, of anything, including the threshold of practicality.
Granted, aluminum driveshafts can be perfectly satisfactory.
It's also possible to build a perfectly good airplane out of steel.
This is neither, so far as we know.
Aluminum is not necessarily the best material for the subject auxiliary shaft, just because of its lower density, because its elastic modulus is also lower, by the same factor as the density. I suspect that 'E' is important to the survival of the subject taper drive joint.
Mike Halloran
Pembroke Pines, FL, USA
RE: Can I do this; Aluminum on Steel?
RE: Can I do this; Aluminum on Steel?
RE: Can I do this; Aluminum on Steel?
TTFN

FAQ731-376: Eng-Tips.com Forum Policies
RE: Can I do this; Aluminum on Steel?
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?