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Post by Deleted on Jan 20, 2010 10:20:31 GMT -5
Does anyone know where I can get my brake rotor resurfaced and drilled?
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Post by lc on Jan 21, 2010 0:00:07 GMT -5
You may want to try a few automotive machine shops and ask if their flywheel grinding machine (that renews the clutch wearing surface of a car fitted with a standard transmission flywheel) could be used.
Barring that there is a fellow on ebay in the 'states that offers the services you want. With a good pair of dividers and layout dye you can do the drilling layout and drill the holes on a drill press. Use a tungsten carbide drill, cutting lube and slow speed and it will drill without issues. I suggest you pilot drill all the holes with a 1/8 in drill first and finish with the size of your choice. You may want to thin the disk down to around 5mm before drilling.
J
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Post by Walms on Jan 21, 2010 6:58:52 GMT -5
Let me know if you find someone Neil, I'd like to get mine done too if the price is right.
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Post by buckaroo76 on Jan 21, 2010 9:20:31 GMT -5
Hey Walms,
Correct me if I'm wrong, but couldn't you have someone put the rotors on a grinder and grind them flat and then have someone waterjet the holes, or put them in a mill with a turntable and drill them.
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Post by lc on Jan 21, 2010 11:01:57 GMT -5
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Post by Walms on Jan 21, 2010 12:54:34 GMT -5
I know a guy at work that happens to have a automotive rotor lathe (cuts both side simultaneously so better for deflection and chatter... He's on vacation right now so I won't know for a bit if he can do the job for us.
LC, did you only take material from one side to minimize setups or was there another reason?
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Post by s3steve on Jan 21, 2010 14:47:06 GMT -5
I know a guy at work that happens to have a automotive rotor lathe (cuts both side simultaneously so better for deflection and chatter... He's on vacation right now so I won't know for a bit if he can do the job for us. LC, did you only take material from one side to minimize setups or was there another reason? I had a guy at work do mine the same way and drilled it myself. I do get a bit of a pulse when I'm hard on the brakes but I haven't used that set up in a couple of years. Ideally grinding would be best then a automotive rotor lathe. |
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Post by buckaroo76 on Jan 21, 2010 16:30:46 GMT -5
I have an automotive brake lathe, and can machine it for you, but if you can get a machine shop to grind it the finish will be much better and more accurate.
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Post by Rick on Jan 21, 2010 19:07:47 GMT -5
I have a lathe as well and I''ve tried to cut bike rotors on it...don't waste your time ..I'm looking into getting some done by my neighbors...I'll post prices when I know for sure...
Rick
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Post by Walms on Jan 21, 2010 19:24:07 GMT -5
I am partial to the blanchard ground surface finish... Is this what your neighbour does Rick?
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Post by zambia on Jan 21, 2010 20:46:34 GMT -5
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Post by Soupdragon1957 on Jan 21, 2010 22:01:28 GMT -5
Twin wheel CBN brake disc grinding is the way to go. We machine brake rotors to better than 5 micron thickness variation & 20 micron mounted run out. Just got to figure out a way of shutting down production for a couple of hours without anyone noticing...  SoupD. |
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Post by lc on Jan 21, 2010 22:03:58 GMT -5
I know a guy at work that happens to have a automotive rotor lathe (cuts both side simultaneously so better for deflection and chatter... He's on vacation right now so I won't know for a bit if he can do the job for us. LC, did you only take material from one side to minimize setups or was there another reason? Walms, When Gary Wolf had his shop in Cambridge back in '75 he had a partner who had a good size machinist's lathe on site. I think the cut was probably taken from only the one side to reduce setup time. The finish was a bit like a rough phonograph record (prolly a very sharp pointed tool bit used). I subsequently drilled it. Wolf's partner must have been good with the setup as there is NO pulsating of the brake. With the cintered "HH" pads I'm now using the lathe machined finish has now worn to match the unmachined finish(original) of the disk. I believe 'moo cuts only one side on a machinist's lathe when he does a disk. Auto brake lathes have been reported to do a poor job on the stainless steel triple disks. A ground finish is prolly the best, hence my earlier suggestion of possibly using a flywheel grinder. J PS/ I had a flywheel ground at an auto shop on the west side of Orangeville (on or just off HWY 9) several years back. Might be woth a call? |
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Post by lc on Jan 21, 2010 22:15:17 GMT -5
Prolly the ultimate (still using the stock disk) would be a thinned and modded disk like 'moo's, that was drilled too.
J
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Post by Deleted on Jan 26, 2010 19:09:58 GMT -5
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