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Rotors


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5 replies to this topic

#1 the blur

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Posted April 13 2020 - 08:04 PM

Is there a good machine shop on LI that can cut rotors ?

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#2 mvphilly

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Posted April 13 2020 - 08:09 PM

I don't know about Long Island but all the guys I know who own shops here in Westchester say that remanufactured ones are so cheap now they just don't cut them anymore.


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#3 thetalonguy

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Posted April 13 2020 - 09:49 PM

Just curious if you looked at the new replacement cost; I.e Rockauto.com. Sometimes it’s almost as cheap as machining your old ones. Plus, you can remove and replace in the same day instead of waiting to get back from machine shop.

I never had my rotors cut, but had a flywheel resurfaced at the machine shop next to S&K speed on RT 109. Might have been like 5 years ago now, but I thought I saw it was like $25/rotor.

#4 BUGZ

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Posted April 14 2020 - 08:44 AM

Just buy new.


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#5 rlitman

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Posted April 14 2020 - 10:32 AM

Just buy new.

 

+1 for new.

 

In years past, you could bring your rotors to a shop and have them turned on a lathe for $5 or so.  But it just doesn't make any sense to do that.  Aside from thinning your rotors needlessly, you're leaving them with a grooved surface that will not bed your new pads as quickly.  New rotors have a "dual directional grind" pattern that is not lathe turned.  This wear pattern (much like the honing done to new cylinder bores) ensures that your pads bed to the rotors as quickly and with as little friction material loss as possible.  That's well worth the extra few bucks of just buying new rotors.


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#6 NRATC53

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Posted April 15 2020 - 01:43 PM

+1 for new.

 

In years past, you could bring your rotors to a shop and have them turned on a lathe for $5 or so.  But it just doesn't make any sense to do that.  Aside from thinning your rotors needlessly, you're leaving them with a grooved surface that will not bed your new pads as quickly.  New rotors have a "dual directional grind" pattern that is not lathe turned.  This wear pattern (much like the honing done to new cylinder bores) ensures that your pads bed to the rotors as quickly and with as little friction material loss as possible.  That's well worth the extra few bucks of just buying new rotors.

any auto mechanic or auto machinist worth their salt puts a non-directional finish on the rotors before taking them off the lathe.. If you don't, you run the risk of pad bounce as the pads try to follow the "Record groove" left by the lathe. If new, QUALITY rotors are available, that's the better way to go. Cut many drums and rotors over the years, sold my Ammco 4000 when I moved


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