Re: [TCML] Primary Support Materials

[Joe Mastroianni <joe@xxxxxxxxxxxxxx>]

Not to veer off topic but I was just machining a new uhmw mandrel for a propeller gap I was building. I had just been using squares cut from a longer piece. Then I got some uhmw rod but you know, a rod of that stuff of any length 1" in diameter does bend. So I wanted to machine everything so I had a concentric part. 

I could get a clean cut with my carbide cut off tool - big cuts. But I couldn't take off a hundredth or a thou no matter what speed or what tool.

Cheers
Joe


Sent from Joe's mobile phone.

On Aug 24, 2010, at 6:33 AM, jimlux <jimlux@xxxxxxxxxxxxx> wrote:

> Joe Mastroianni wrote:
>> Hi Brandon,
>> I've had little luck gluing UHMW or HDPE,
> 
> PE is essentially impossible to glue with conventional techniques. Mostly you weld it (using a hot air plastic welder and PE filler rod)
> 
> There are chemical preps you can do which alter the surface and (this will be appealing to coilers), there's a process where a corona discharge is used to create lots of little twisty holes in the surface, so the epoxy has something to "key" into.
> 
> 
> even with various types and
>> grades of epoxy. I've been able to tap both, and drill both with no problem. I've used both brass and nylon screws which all hold well, as long as you don't over tighten, as you can imagine. Machining - as in turning on a lathe, has been more difficult. I've yet to find the tool/speed combination that gives me a clean cut.
> 
> Very sharp tools needed, big cut, lots of coolant.  Once the tool heats up, the game's over.
> 
> 
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