[AT] Brake band material

[Larry D Goss]

Would a Forstner bit do the job?  Make that the first operation and then do 
the through hole after the counterbore is done and there is a centering hole 
in place?  Just a suggestion.

Larry

----- Original Message ----- 
From: "John Hall" <jthall at worldnet.att.net>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Thursday, July 05, 2007 7:43 PM
Subject: Re: [AT] Brake band material


> By straight I meant I put absolutely no relief on the cutting edge. It
> would never cut metal but works OK in the brake band material. My 
> intention
> was to keep the tool from grabbing and sucking into the workpiece.  One
> other note, I undercut the pilot with the cutoff wheel--kind of hard to 
> get
> a cutting edge all the way up to the pilot otherwise. If you can use
> countersunk rivets, I'd go that route.  Even if they are an odd angle you
> don't have a countersink for you could sharpen a drill to the correct 
> angle.
> Picking up a drilled hole without a pilot may get to be a pain.
>
> John
> ----- Original Message ----- 
> From: "John Wilkens" <jwilkens at eoni.com>
> To: "Antique tractor email discussion group" 
> <at at lists.antique-tractor.com>
> Sent: Thursday, July 05, 2007 7:04 PM
> Subject: Re: [AT] Brake band material
>
>
>> Yeah, I think I can do that.  Hadn't thought of using two plates and
>> a pilot.  One thing I can't visualize  is the "straight cutting
>> edge"  you mention.   Thanks!   John W.
>>
>>
>> At 01:46 PM 07/05/2007, you wrote:
>>>You asked how, so here is what I did. Fair warning, I'm a machinist so
>>>it's
>>>not quite as complicated or time consuming as it might seem.
>>>  I wanted to use the same type of rivets as possible on my tractor so I
>>>needed a counterbore. Some rivets are countersunk, and not all are at the
>>>same angle. Anway I made a counterbore tool out of a drill bit using a
>>>pedestal grinder, lathe and dremel tool. I roughed the end of the tool to
>>>serve as the pilot on the pedestal grinder. Then I put it in the lathe 
>>>and
>>>clamped my dremel with a cut off wheel in the tool post. I turned the
>>>lathe
>>>and the dremel on and started grinding. Instead of putting any relief
>>>angle
>>>on the tool I left the cutting edge straight--since I would be doing this
>>>in
>>>the drill press I didn't want it to grab. I set up two plates on the 
>>>drill
>>>press. The bottom one had a hole about the size of the pilot. The top
>>>plate
>>>was made larger to clear the tool. I set a gap between the 2 plates about
>>>.010" thicker than the material so I could slide it thru. I cut the drill
>>>press off between holes so I could use the pilot to line up the lining.
>>>Worked great--hole depth didn't vary .005". If I'd have thought about it
>>>earlier in the week I would have made the tool at work--it would have 
>>>been
>>>faster but not near as much fun!
>>>
>>>Oh yeah, I clamped the lining to the bands and drilled all the holes 
>>>first
>>>with a hand drill.
>>>
>>>John
>>>----- Original Message -----
>>>From: "John Wilkens" <jwilkens at eoni.com>
>>>To: "Antique tractor email discussion group"
>>><at at lists.antique-tractor.com>
>>>Sent: Wednesday, July 04, 2007 11:59 AM
>>>Subject: Re: [AT] Brake band material
>>>
>>>
>>> >  Can you tell me the procedure for
>>> > countersinking the lining for the rivets?     John W.
>>> >
>>> >
>>>
>>>
>>>_______________________________________________
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>>
>>
>>                    In the wide-open spaces of NE Oregon
>>
>>
>>
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