[Boatanchors] Chassis Mechanical Question

[Richard Knoppow]

----- Original Message ----- 
From: <whitebear1122 at comcast.net>
To: <Boatanchors at mailman.qth.net>
Sent: Friday, February 14, 2014 7:56 AM
Subject: [Boatanchors] Chassis Mechanical Question


>
>
>
> Greetings. I have a mechanical question. I am in the 
> process of drilling , milling, and hole punching several 
> chassis's fo r my HBR-13 receiver project. I have all the 
> holes punched except for three octal socket holes. I just 
> discovered the octal ceramic sockets require a 1 1/4" hole 
> and my Greenlee punch is 1 1/8". My question is this: Can 
> I realistically file 1/16" all the way around with a rat 
> tail type file and have the hole look clean. I'm worried 
> I'll start filing and it will end up looking like crap or 
> become goofy shaped. Is there some sanding barrel shaped 
> attachment for a drill that would open the hole slightly 
> and evenly?
>
>
>
> I wonder if anyone has a used Greenlee 1 1/4" inch punch 
> for sale. I've got a nice selection put together so far, 
> including 5/8", 3/4", 7/8", and 1 1/8". I've never used a 
> punch before this and they have been fabulous! I did have 
> to learn a lesson though. I was so darn careful to be 
> precise in my layout drawing, and transferring those hole 
> dimensions to the chassis. I used the recommended punch 
> screw hole dimensions in the Greenlee instructions and 
> then found out the holes didn't need to be that big, so 
> the punch floated around too much and all the tube socket 
> holes are slightly offset. Darn. Maybe it'll look better 
> when I take the masking tape off. :)
>
>
>
> Thanks. 73, Sc ott WA9WFA

      Punches are great, I used to have a set.  I don't know 
if conical reamers come large enough for this but you might 
check the on-line hardware stores for one.  Its possible to 
enlarge the hole using a file but is tedious.   For making 
round holes of various sizes a fly cutter is useful. I think 
there is another name for these but can't remember it.  Its 
used in a drill press and has an arm with a cutter much like 
a lathe tool. These are especially useful for making large 
holes like meter holes.  I've seen them for sale recently 
but don't remember where. A google search will probably find 
them.
     I think Greenlee and Pioneer Broach  are still in 
business but the current prices on chassis punches is 
astronomical.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com