Pully On A Treadmill Motor Shaft?

Franko said:
This is what I found when searching Fenner Drives that looks like it would be applicable to my motor shaft.
They are a bit costy, at about $70.

View attachment 99790

  • Series: Trantorque OE
  • Component Bore Diameter: 32 mm
  • Shaft Diameter: 17 mm
http://www.fennerdrives.com/trantorque/_/Trantorque-OE-17mm/?s=ZnwyMzE4Oml8MTAyNA==
Click to expand...
I used one of these on my Kubota.I bored a Love joy and used the Fenner to connect it to the 22mm shaft coming off the crank.Was able to find the needed size on ebay for $20. shipped.
 
Franko, I have a spare 1/2 x 13 LH tap if you need one. I bought a batch(new old stock) on E-Bay a while back. I've made a couple adapters for treadmill motors with them. All the DC PM treadmill motors I've collected have that thread on them. I made the pulley for the TM motor that runs my mill from the small end of it's flywheel.

Chuck
 
Maybe trade for something you have extra?
I don't remember what I paid for the box of 5 taps, but it wasn't much.
PM me your address and I'll put one in the mail.

Chuck
 
I am new to hobby machinist, but I do have a tip here. In addition to the left hand 1/2 x 13 thread on tread mill motors, the pully issue is easily solved. Type L tempered copper has an almost perfect ID to fit the 17mm shaft ( usually less than .03 mm ie: an slight interference fit) While the OD is within +/-.001 of a 3/4" pully bore (makes an excellent no play bushing). I have used this trick many times in the past, and I will try to post pictures later.

Also I have successfully used multiple flats ground into the OD of the 17mm shaft and a machined Steel pulley with multiple set screws, even adding a third set screw (offset 60deg.).
 
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dpstanfill said:
I am new to hobby machinist, but I do have a tip here. In addition to the left hand 1/2 x 13 thread on tread mill motors, the pully issue is easily solved. Type M tempered copper has an almost perfect ID to fit the 17mm shaft ( usually less than .03 mm ie: an slight interference fit) While the OD is within =/-.001 of a 3/4" pully bore (makes an excellent no play bussing). I have used this trick many times in the past, and I will try to post pictures later.
Click to expand...
OK, I'm a bit lost here. I assume you're talking about pipe, not fittings.

Went to http://www.copper.org/publications/pub_list/pdf/copper_tube_handbook.pdf and looked up pipe dimensions (Pages 62 thru 64 for K, L, and M). Parts of the tables for K, L, and M (with my labels) are reproduced below.

Nothing in the M table looks like it has and OD of ¾". However, both K and L pipes of nominal ⅝" size have ODs of .750". Of the two, it looks like L's ID of .666" is a better fit to 17mm (.669") than K's ID of .652". Am I missing or mis-reading something here?

Your tip is very useful, but I just want to be sure I get it right.

K Copper pipe dims.jpg L Copper pipe dims.jpg M Copper pipe dims.jpg
 
Sorry, thanks for catching that it is Type L rigid but in 5/8 as the wall is nominal .042 though it seems to run closer to .0405 to .041 I have a piece in front of me that I just cut a bushing from and the ID Mich's at .669 and is a no slop slight interference fit for my motor shaft that I have on the bench, and the OD comes in at .751 (now where is my roll of 120 grit). Type M does not even come in 5/8 ID. As an added note Grainger down here stocks it in 2 foot lengths for $5.84 including tax. None of the big box stores seem to carry 5/8.

I edited my previous post to eliminate confusion.
 
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