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Post by spyug on Oct 18, 2006 14:55:53 GMT -5
As part of my mark 2 mods for the tracker, I am doing a swingarm conversion. The arm I have found is a RZ350 steel box section much like the radian type.
In order to accommodate the axle, I will need to enlarge the axle blocks from 17mm to 20mm. The blocks seem to be either aluminum or some alloy and come free from the swingarm tubes. I don't really anticipate a problem drilling but I'd like to know how to center them in the drill press so as to get an exactly centered hole.
Suggestions please.
Cheers,
Spyug.
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Post by slide on Oct 18, 2006 16:14:12 GMT -5
Hi Spy. Measure the width of the adjuster, divide by two and set up a fence at that distance from the center point of you drill bit. You can also set up a separate fence for the length in the same fashion and it will be true to go. Take a pic of the arm for us to see what it looks like.
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Post by shifty on Oct 18, 2006 18:55:50 GMT -5
If I understand you correctly ... a bushing with drilled hole the same size as your center punch will do.
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Post by joebob1999 on Nov 9, 2006 20:01:46 GMT -5
Do you have anything like a live center from a lathe? Anything cone shaped that you can chuck in the
drill will work. Just chuck it up in the drill press. Bring the chuck down and press the center into the
existing hole. While you (or someone else) holds down pressure, clamp down your part. No measuring, no math (good for me) and works every time. You are going to want to drill
slowly and with some cutting oil.
It is very easy for the bit to bite into aluminum and knock everything out of whack.
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Post by hesredbird on Apr 19, 2007 3:43:25 GMT -5
If you have a rigid set up (solid vice), you could chuck up a 17mm reamer and slide it in the hole. Clamp the work piece solid in the vice and remove the 17mm reamer without moving the work. Replace with a bigger drill (20mm?) and carefully drill out the work piece.
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Post by 71XS1B on Apr 19, 2007 7:22:52 GMT -5
I've used a similar technique to hesredbird's with great success. If you don't have a 17mm reamer, find something that is 17 mm in diameter and use that to center your work.
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Post by hesredbird on Apr 19, 2007 8:50:45 GMT -5
Well, you could put the axle in the hole and chuck it up. Remove the axle and replace with the 20mm drill and go. Remember, alloys or aluminum cut quick and easy. Go slow and be careful of what you use for coolant. Some things don't mix well with aluminum. Maybe a little water soluble oil & water for a lube. If you don't have that, just use plain water. Keep the RPMs down on the drill and use easy pressure on the drill.
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Post by marcoxs on Apr 11, 2009 6:50:03 GMT -5
Kerosene is the best lube for machining ally  |
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Post by twinfan on Apr 11, 2009 7:10:45 GMT -5
ATF, Dexron, Mercon or the like are really good for working alloy also.
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