[R-390] First R390A - let the adventure begin

[Bill Guyger]

Hi Stan
I cut Aluminum all the time with a Saber saw (scroll saw) works great. 20 TPI might be a bit fine, I typically use 14 T. You DO NOT want to use really fine blades for Aluminum they start galling i.e. teeth filling with metal and metal coating itself onto the sides of the blade.
I cut a tiny bit outside the line and then use a sanding station with 100 grit (or so) to bring it down to the finished dimension.
You can cut circular areas with a saw by approximating the curve (kind of like you'd do in a Calculus equation) then filing it down to the line. I typically draw the line with a metal scribe so I have a sharp line to file down to. After deburring you can "polish" the edge by running a round steel object like a screw driver round and round the opening.
Bill AD5OL

      From: Stan Gammons <s_gammons at charter.net>
 To: r-390 at mailman.qth.net 
 Sent: Tuesday, October 17, 2017 10:24 PM
 Subject: Re: [R-390] First R390A - let the adventure begin
   
I meant I cut it a little long.  Dang I can't type today...



On 10/17/2017 10:20 PM, Stan Gammons wrote:
> Hi Don,
>
> Ok.  I cut the section a little lone where the screw goes, but this is 
> what it looks like.  Still needs a little work, but I think it will 
> clean up and work Ok.  Instead of using the band saw, I think I'll 
> try a 20 TPI blade in a scroll saw to cut out the next one.  Never cut 
> metal with a scroll saw before though.
>
>
> 73
>
> Stan
> KM4HQE
>
>
>
> On 10/17/2017 10:09 PM, Don Reaves wrote:
>> Stan,
>> Attachments are permitted now, but they need to be limited in size to 
>> less than 1MB per message.
>> People would probably like to see your homebrew clamp.
>>
>> Don
>>
>>
>>
>>
>
>
>
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