Motor shaft material?

[BlazerB52]

Trying to aquire parts for motor build with 8mm shaft.
Will this material be okay? Not sure what 303 material is..
Or can someone point me to a good source.
Thanks for any help... :)
Link: http://www.smallparts.com/products/descriptions/cgsx-mcgsx.cfm

[BlazerB52]

Hard site to navagate in. Would the rod material below be better?

Says it is for shaft material.

link: http://www.smallparts.com/products/descriptions/cgdr_cgfs.cfm

[Aethertek]

303 is a type of stainless non hardened easy to machine. If you have to do any shaping, lathing on the shaft this will be easier to work than a hardened shaft material like 440 Small parts carries the 303 in precision Ground rod 8mm is part #B-MCGSX-08 lengths of 6,12,24 & 36 inches.

[BlazerB52]

Only machining that I planned. Was for slot at end of shaft for e-clip and 2 flats in shaft for set screws in bell housing after a press fit. So should I use the harder stuff for such a big motor? Shaft will be supported by (4) bearings.

[Micro Dan]

Hard site to navagate in. Would the rod material below be better?

Says it is for shaft material.

link: http://www.smallparts.com/products/descriptions/cgdr_cgfs.cfm
this is pretty much known as drill blanks.
drill blanks are easy to find at industrial supply co., normally O 1 tool steel in the annealed state.
perfect for short shafts but it will bend if not careful.
Dan

[BlazerB52]

Maybe I should give a little more info on motor I am trying to build.So you guys know what loads and stress might be.

12 Stator = 54.6mm x 32mm thick(64 lams.)

Bell = around 67mm dia.

probably a 16x? or larger prop?

Have not figured out the winds ,magnets or turns yet...

Or what it will go in. Probably a warbird of some kind.

[ImaBiggles]

303 is a SS good for machining, so no - its not the best material for a shaft but it will work. Although it doesnt tell ya its temper, I bit that it is very soft material - not ideal for shafts. Look at mcmaster.com, search drill blanks. If you want the best blank, part number 8791a31 - but it is expensive. else look at part number 2900a358 1/10th the cost as the tungsten alloys but tempered to high hardness. at 8mm, thats a pretty sturdy shaft and most likely will not bend unless you have a very hard 1 point landing - but what I hate about soft shafts is that they wear very poorly around contact points like bearings, setscrews etc.

[LBMiller5]

At work a few months ago, they retired an old Tektronix Phasor 740 Color Laser Printer. I was told to dispose of it, so I took it home and stripped it down for parts before I threw it out. There were lots of interesting items inside, including some massive brushless motors and some very nice precision steel shafts that would make excellent motor shafts for larger motors. Most of the shafts had several e-clip grooves already machined into them, so if you cut the right part of the shaft out, and make your bearing tube the proper length, you would not have to do any machining on the steel shafts other than cut them to length! :D

By the time I was done, I had a whole table full of cool parts to play with. Here is a photo of all the stuff that I eventually took from the printer.

http://innov8tivedesigns.com/rcgroups/Phasor14.jpg



All together I ended up with the following:

Three 50mm brushless motors

One ~35mm brushless motor

One stepper motor

Four 24 volt brushed motors

Five magnetic clutches

Three 24 volt cooling fans

One 10mm steel shaft

Two 8mm steel shafts

Eight 6mm steel shafts

One 5mm steel shaft

Plus a whole box of nice screws, bushings, washers and E-clips.


I popped open the big brushless motors and found some nice stators inside. The 2 larger ones are 50mm diameter by 18mm thick, and the smaller one is 50mm diameter by 13mm thick. The motors have dual ball bearings that look to be around 6mm ID x 14mm OD x 5mm thick. Here is a photo of one of the larger stators.

http://innov8tivedesigns.com/rcgroups/Phasor15.jpg



And here is a shot of the stator with the tape measure, it's just a tad under 2 inches (50 mm)

http://innov8tivedesigns.com/rcgroups/Phasor16.jpg


Look around the office, and if you see any old printers that are about to be retired, offer to take it off their hands! They can be a real treasure chest! :)

Lucien

[BlazerB52]

Have been parting out printers and have not come across any 8mm rod stock from rollers yet.

[BlazerB52]

Wish I could find a Gold Mine like your's Lucien....
But I did get two big-uns out of it. Will double lam them to make one.
Now If I can talk the wife out of some funds for a Mini lathe to make bell and other goody's. Have her talked into a New 27 foot travel trailer. So I better keep her veeeeeery happppy...
Thanks for input Guy's.

[BlazerB52]

Here is what the material is for:

54.6mm dia. x 32mm thick has 4 sets of bearings pressed in it.

[trashbug]

You might want to consider ejector pins if you don't have to do any machining. Here's a site :) (http://www.plastixs.com/ep07.html)

LOL

[BlazerB52]

The ejector pins look good. The larger head at end would be great for not having to machining a retaining clip groove, as long as it would ride on inner race of bearing. This would make great shafts for smaller motors also. No small groove to cut and the prices are great. I have 2 people who have contacted me about shaft material. But if I need more in future I will give these a shot.Only draw back is they said they might have minumum order with purchases..
Thanks for input. :)

[olmod]

Have you noticed the head shapes arranged in pairs? but individually not symetrical, I dont know how much difference this would make to the esc
but others may.

[BlazerB52]

Noticed that too. Not sure how that will effect things been looking for info about that. Has not been mentioned so far. I was thinking it would be okay as long as all of them are symetrical(paired up evenly around) . Anybody have a idea how this would effect the ESC? Would I need to change the timing?

[LBMiller5]

If you wind it LRK and use the closer pairs, it should not make any difference at all. If you use an ABCABCABCABC wind, there would be a slight timing variation of 4-5 degrees on some of the poles.

Lucien

[staggerwing]

One thing to keep in mind in these nice used precision shafts should you plan on machining or even cutting one, is that most are case hardened & surface finished after they have been machined for whatever purpose---just putting a file to one will tell you.

[BlazerB52]

Will try to use a design where I will press fit shaft and bell. I will only need a small flat spot ground for set screws to keep from slipping. Hope that will work, if not back to the drawing board. If I up the advance on ESC will that take care of the degree problem with stator spacing or is it a different animal I am dealing with?