PDA

View Full Version : How about drums ??



spkrman15
07-31-2004, 06:50 PM
Alright smart guys, I have now decided i will never do my own rotors again...hehe yeah right...

How about the ream drums, or in the case of my 1962 bel-air...the front and rear drums. Can i turn those.

And do not give me the "it is so cheap to bring them to the local shop" speech. Half of you will spend 15 minutes turning a 3/8" x 2" coarse bolt because... you know it is so easy http://bbs.homeshopmachinist.net//wink.gif

Oh and to all of you who are talking torque specs and tightening sequences are "in the book" What are you guys talking about? What book? I never use a book!! http://bbs.homeshopmachinist.net//smile.gif

Rob http://bbs.homeshopmachinist.net//smile.gif

wierdscience
07-31-2004, 08:53 PM
Okay,so your a cheap skate,uuuhhh frugal machinist http://bbs.homeshopmachinist.net//biggrin.gif

Sure you can turn them,just chuck up on the outside of the drum with the four jaw,indicate the center pilot so it runs true and concentric and cut away.Just be sure and check the max dia.,remember the guy you run into when your brakes fail might be me http://bbs.homeshopmachinist.net//eek.gif http://bbs.homeshopmachinist.net//biggrin.gif I can hear it now(ME WEARING A NECK BRACE)"yes your honor,thats the man who hit me right there"! http://bbs.homeshopmachinist.net//biggrin.gif

Tim Clarke
07-31-2004, 09:12 PM
Having turned a couple truckloads of drums over the years, I'll offer my thoughts. These may or may not agree with others. Brake lathes have specialized tooling to hold drums and rotors in a manner that simulates the way they run on the car. You need to duplicate the way they are attatched to the car for a reason, that is, that they need to turn with a minimum of runout. Gripping a drum in a 4 jaw will doubtless pinch the drum. After you release it, it will return to it's unloaded state. It was bored round, but when released, will be square. Well, I guess a better term would be lobed. A better way might be to make a fixture, that duplicates the axle flange. Also, you'll need to make up a rubber band to wrap on the OD of the drum to reduce harmonics. Several bungees may do it. A junk drum for experimenting is in order. If you decide to give it a try, let us know how it works out. The drum lathe at work uses neg rake carbide inserts. If you have a stout inserted boring bar, it would worth a try.

TC

speedy
08-01-2004, 03:44 AM
Hey cheapman15!(joke) Tim is right you will need a stout boring bar or at least a very large bastard and rubber wrapped tightly about the work piece to reduce those harmonics. If your lathe jaws run true on their face, hold the drum up to them and bring the t/stock centre up to the drum centre and load it up somewhat(if the running centre disappears through it could be a bit small http://bbs.homeshopmachinist.net//smile.gif) Dog drive the drum. Good hunting you cheap bugger; I like your `try it` attitude

wierdscience
08-01-2004, 07:39 AM
Tim,Speedy,you guys really shouldn't use a cheater pipe on your chuck wrenches http://bbs.homeshopmachinist.net//biggrin.gif

No,the drum won't warp or distort under the jaw pressure,unless you have a 3' long pipe on the chuck wrench.After all,you will be clamping on the web side of the drum anyway.

Geez Sparky,your the fourth guy this week I have talked to thats doing brakes on an old Chevy,must be contagious http://bbs.homeshopmachinist.net//biggrin.gif

Oh,once you master turning your own drums and rotors for proper credit lets see you mount up the shoes on a jig and arch them to fit the drums http://bbs.homeshopmachinist.net//biggrin.gif

SGW
08-01-2004, 08:01 AM
I'm with Tim -- make a fixture to hold the drum AS IT IS HELD ON THE CAR. Otherwise you're aksing for trouble.

spkrman15
08-01-2004, 08:08 AM
You mean this little puppy?

http://www.magma.ca/~idjs/machining%20pictures/belair1.jpg

Rob http://bbs.homeshopmachinist.net//smile.gif

Mike W
08-01-2004, 02:12 PM
Come over to my shop. I have a brake drum lathe. It has a big ass boring bar. http://bbs.homeshopmachinist.net//biggrin.gif

SteveC
08-01-2004, 11:43 PM
How does one post a pic directly, like this, without using a link to the photobuckit?

Steve

Joel
08-01-2004, 11:58 PM
It is a link. For Photobucket, just copy and paste the IMG instead of the URL link, and your picture will appear.

Read the last post:
http://bbs.homeshopmachinist.net//Forum2/HTML/000234.html

speedy
08-02-2004, 07:30 AM
Hey ya Rob, is that a Bell Air Biscayne or Impala? Tasty looking. What are you running? Years ago Andy and I were up at the Tutukaka pub (near Whangerei NZ ) he was pissed, I wasn`t. So I drove home to his Aunts place where we were staying, 12:00 midnight, round the bend and straight ahead, missed the large pile of road gravel, Andy tore at the steerwheel and prevented us from launching ourselves to oblivion (160ft down)you know what? I WAS pissed, so pissed I didn`t know it http://bbs.homeshopmachinist.net//biggrin.gif Any way it was a great `61 4 door with a baby 283 and 2 stage, straight as ever and he never really respected the thing. had loads of fun chasing though. doing those shoes wouldn`t be so difficult now would it?

spkrman15
08-02-2004, 04:40 PM
What am i running? You mean what was i running. http://bbs.homeshopmachinist.net//wink.gif

http://www.magma.ca/~idjs/machining%20pictures/belair2.jpg

I was taking the car out of storage last summer. The first day out and i dropped a valve, due to a broken spring, and found out what it was like for the Nascar guys when they blew a motor. The only bad thing, other then the obvious is my buddy wasn't with me. We are still laughing about it today

It is a 1962 Bel-air. It origanally had a 283 and a 2 speed automatic. I have met some of the previous owners over the years. Before the motor blew up i had a 350 with a comp X-treme 265 cam. It was nice. The motor was out of my dad's 5 ton from the farm. Recycle everything.

My plans are to rebuild another 350 to put a Weiand 147 cid blower on it. I figure that would be WAY cool. The best time i ran at the drags was a 13.80 seconds. I figure it wasn't bad for a 500.00 motor. Lots of fun

http://bbs.homeshopmachinist.net//smile.gif

speedy
08-02-2004, 06:07 PM
Yup, fun is the game. I was feeling like crap the other day, didn`t like it at all, gave it away for someone else to use. I recommend fun any time http://bbs.homeshopmachinist.net//biggrin.gif.Gotta 1986 VK 1/2 Holden Royale in my shed,no rust(10c hole in boot wheel well) and done 150,000km and i`m the 2nd owner(10yrs or so). Its got the big 3.3ltre Bosch injected mtr and rego has been on hold for God knows.No one wanted to pay reasonable $ so it waits for a 3.8 pre ecotech mtr (buick to you ) or a 308 transplant (they slot straight in) It`s all going to happen sometime later.

sandman2234
08-04-2004, 11:16 AM
SteveC,
With photobucket...
Use the last of the 3 options, (IMG), copy and paste that link to your post. When you view it, it should be the picture, instead of a link.
These pictures posted so far weren't posted with photobucket, they used something else.
David from jax

[This message has been edited by sandman2234 (edited 08-04-2004).]