On 9/19/2014 1:02 AM, Don Y wrote:
> On 9/18/2014 9:45 PM, rickman wrote:
>> On 9/18/2014 7:59 PM, Jim Thompson wrote:
>>> On Thu, 18 Sep 2014 19:54:24 -0400, rickman <
gnu...@gmail.com> wrote:
>>>
>>>> On 9/18/2014 5:51 PM, Jim Thompson wrote:
>>>>> I have some blank wall outlet cover plates, claiming to be "nylon".
>>>>>
>>>>> Do you think I could punch a hole thru one of these with a chassis
>>>>> punch, or is it likely to shatter?
>>>>
>>>> It is hard to beat a sharp drill. I suppose you want a larger hole
>>>> than you have a drill for?
>>>
>>> I have a nice hand reamer that can get me up to ~1/2", but I need 3/4"
>>> this time. I may just have to hand file my way :-(
>>
>> I don't get it. 3/4 inch should be a flat bit. I've had one forever
>> and it's not like I have tons of tools. They are what, $2? They cut
>> pretty clean holes, especially when new and still sharp. They have a
>> blade on the edges that cut like a hole saw. If the plastic is not too
>> thick the bulk of the blade won't even be used. I'm not sure if it
>> would be best to cut from the nice side down or the ugly side up... I
>> suppose you could do a bit of both and meet in the middle to minimize
>> the chance of splitting out. Certainly use a backing block no matter
>> what.
>
> The problem with most drills will be one of heating. The nylon/plastic
> wants to flow (or chip -- e.g., the pilot) instead of being cut cleanly.
I think you are smoking dope with this one. I have drilled plastic
plenty of times with no problem from heating. Usually I get very nice
curlies coming up similar to drilling metal which *will* heat up.
> I'd be tempted to try a brace with a 3/4 bit -- primarily because
> of the GREATLY reduced (:>) RPM's. If you're only doing one (or
> a dozen), there's very little time to be saved with a faster drill
> (esp if there is substantial rework/cleanup required).
You've never heard of a variable speed drill???
> I had to make some "recessed RJ45" wall plates (i.e., so I could
> plug an umbilicus into the wall plate and hide the service loop
> *in* that recess). I chose a Dremel *expecting* to remove a lot
> of material (I married two different wall plates to get the
> result I wanted).
>
> But, it was a real problem keeping the material from "being
> semi-liquid" (which would have been unsightly to clean up had my
> operations been on the exposed side of the plate)
A Dremel abrasive tool is not a drill bit. Of course that will heat up.
BTW, I bought the Dremel drill press in spite of the fact that it has
plastic parts. It is a piece of crap. When you pull the head down the
drill bit moves all over the place.
--
Rick