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  #1  
Old 05-15-2010, 11:58 AM
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can drilled rotors be turned in a lathe?

hi folks!


i just picked up a nice rolling shell with a TON of good stuff on it...

i think its the in the best shape rust-wise of the three i now have, so IT will be the basis of the rally beastie!

it has nearly new drilled brake rotors and pads, with only a small amount of rust on rotor surfaces due to being parked for a few months..

can these be cleaned up in a brake lathe?

or does the cross drilling "fetch" on the lathe teeth and cause an issue with the brake guy?


thanks!

rob
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  #2  
Old 05-15-2010, 12:54 PM
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Re: can drilled rotors be turned in a lathe?

I have had my drilled/ dimpled rotors cut down slightly. The shop had no problem doing this.

Turned without catching on the edges of the dimples.

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  #3  
Old 05-15-2010, 01:12 PM
stevek stevek is offline
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Re: can drilled rotors be turned in a lathe?

Hope this helps - 'skimming' the discs is possible whatever the ventilation. What I have found, though, is that you need to bed them in and form some kind of 'skin' on the surface before you work them hard. If not, they warp. Discs aren't very dear to buy new these days btw.
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  #4  
Old 05-15-2010, 03:55 PM
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Re: can drilled rotors be turned in a lathe?

I wouldnt even bother lathing them for a little bit of rust. If you are installing new pads, a thin coat of rust is actually beneficial. Remember lathing reduces the amount of metal in the rotor leading to faster brake fade and greater chance of warpage.
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  #5  
Old 05-16-2010, 07:33 AM
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Re: can drilled rotors be turned in a lathe?

yeah...i've been debating the worthiness of even bothering...the rust REALLY is almost not there....

to be honest, ANYthing is better than what i'm running now! lol rust and all....



im able to get genuine subey parts at below dealer cost (thank gawd for friends in high places!!)

even so, 4 discs and f/r pads came to 800$$ !!!!
gulp!!

in hindsight, i shoulda bought off of ebay....

oh well...

thanks for the input everyone!

that will be next weekends project...sexy new brakes!!
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  #6  
Old 05-16-2010, 11:29 AM
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Re: can drilled rotors be turned in a lathe?

Quote:
Originally Posted by SoCal LS-L View Post
I wouldnt even bother lathing them for a little bit of rust. If you are installing new pads, a thin coat of rust is actually beneficial. Remember lathing reduces the amount of metal in the rotor leading to faster brake fade and greater chance of warpage.
A little sand paper and they should clean up just fine. Some of mine will have rust on them after a week or so and if I drive to town and back you would never know it.
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  #7  
Old 05-16-2010, 01:02 PM
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Re: can drilled rotors be turned in a lathe?

Quote:
Originally Posted by rallyingrob View Post
yeah...i've been debating the worthiness of even bothering...the rust REALLY is almost not there....

to be honest, ANYthing is better than what i'm running now! lol rust and all....



im able to get genuine subey parts at below dealer cost (thank gawd for friends in high places!!)

even so, 4 discs and f/r pads came to 800$$ !!!!
gulp!!

in hindsight, i shoulda bought off of ebay....

oh well...

thanks for the input everyone!

that will be next weekends project...sexy new brakes!!
You should take them back to the dealer & order some from Applied Rotor Technologies. They are producing mine on May 24. Cheaper & Better.

BTW Steel Subaru marks their stuff up over Subaru Canada retail by 15% or so. O'Regan's in Bridgewater is fair price and most anyone can get the "shop" discount.

Quote:
The cost of the ART Front & Rear Brake Kit on your 1992 Subaru SVX 4WD would run you $514.00 plus shipping & handling to your zip code.

The ART Brake Kit consists of gas-port slotted, cryogenically treated brake rotors along with a set of Posi-Quiet Extended Wear Semi-Metallic Brake Pads.
Applied Rotor Technology
www.appliedrotortechnology.com
Office / Fax: (714) 527-9400
Ask for Pad
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Last edited by SVX_MY_BABY; 05-16-2010 at 01:06 PM.
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  #8  
Old 05-18-2010, 06:52 PM
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Re: can drilled rotors be turned in a lathe?

sadly its too late now...they've been on the car for two years...

my source is awsum....genuine Subey rad taxes included brand new was sub 400$

front fenders are (i think) 125$
same with rear quarters....
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  #9  
Old 05-19-2010, 06:21 AM
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Re: can drilled rotors be turned in a lathe?

To answer the original question, yes they can be turned but you need a "rounded" bit. Very few places use these as they are more expensive than standard tips.
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  #10  
Old 05-20-2010, 04:33 PM
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Re: can drilled rotors be turned in a lathe?

ahhhhhh

they must be awful expensive....ive been in/around shops for ummm gee 25 years now and all ive ever seen were the traditional triangular bits...

i didnt even know there were other types!!
(although it makes sense in retrospect......)
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  #11  
Old 05-20-2010, 07:59 PM
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Re: can drilled rotors be turned in a lathe?

How does a rounded bit "cut" instead of just score?
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  #12  
Old 05-20-2010, 08:26 PM
oab_au oab_au is offline
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Re: can drilled rotors be turned in a lathe?

Quote:
Originally Posted by SoCal LS-L View Post
How does a rounded bit "cut" instead of just score?
Just the cutting edge is curved, so it removes metal progressively across the holes.

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Old 05-21-2010, 08:07 PM
James Scott James Scott is offline
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Re: can drilled rotors be turned in a lathe?

I had 'em.. . Dint like 'em! Never noticed any better braking, but some shops won't turn 'em.. . some will. Best to countersink if they're holes. Ironically, the small shop by my work wouldn't touch 'em for a $12 a rotor turn, but the Pep Boys would turn 'em for $4! Ha!

I get standard rotors from Autozone or Pep Boys.. . no problems. The cross-drilled rotors warped sooner for me too!

Jim
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  #14  
Old 05-21-2010, 11:43 PM
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Re: can drilled rotors be turned in a lathe?

Quote:
Originally Posted by rallyingrob View Post
ahhhhhh

they must be awful expensive....ive been in/around shops for ummm gee 25 years now and all ive ever seen were the traditional triangular bits...

i didnt even know there were other types!!
(although it makes sense in retrospect......)
Guess you just learned something new.
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  #15  
Old 05-22-2010, 08:14 AM
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Re: can drilled rotors be turned in a lathe?

yep!!

my poor departed mom always said the day ya stop learnin is the day ya die!
lol

i guess she was right!

god bless her heart!
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