One good source of HDPE material for coil construction ( base parts or secondary end caps ) is cuttingboardcompany.com
The cutting board material itself is easy to saw and or drill though it can be messy. Use lower speeds and cutting edges made for plastic.
I've even turned circles of the stuff on the lathe. Clean up is a bit of a chore, but the results are good.
Cheers
Joe
> On Mar 3, 2014, at 3:15 PM, Krux <krux@xxxxxxxxxx> wrote:
>
> HDPE is less expensive. I uses 24"x24" sheets from Grainger (found them to be less expensive than McMaster for plastic sheets) for my coil. Four sheets cost me $160 after shipping. USPlastic has larger sheets for much less per sqare inch, but you're going to probably pay a bit more in shipping.
>
> perl -e 's==UBER?=+y[:-o]}(;->\n{q-yp-y+k}?print:??;-p#)'
>
> Jason Johnson <jasonmsusolar@xxxxxxxxx> wrote:
>
> Polypropylene is another excellent choice.
>
> I find McMaster to be an excellent source for small sized pieces. Not
> usually the cheapest, but typically competitive.
>
> http://www.mcmaster.com/#standard-polypropylene-sheets/=qxl3vu
>
> Of course they have UHMW as well, but I think PP is cheaper.
>
> - Jason
>
>
>> On Sun, Mar 2, 2014 at 3:08 PM, Jim Lux <jimlux@xxxxxxxxxxxxx> wrote:
>>
>>> On 3/2/14 11:42 AM, t-burns14 wrote:
>>>
>>> I have an opportunity to use a CNC milled piece for my base, as seen
>>> in one of the Geek Group videos. The milled a spiral into the piece
>>> of plastic and then just hammered the tubing into the spiral cutout.
>>> I'm wondering what material would be good for that. They might have
>>> been using High Density Polyethylene, because I remember them saying
>>> it was food grade and polyethylene is used for cutting boards. Any
>>> insight? Thanks
>> It probably *was* a HDPE cutting board, unless they happened to have a
>> source for HDPE scrap. Otherwise, you're buying a 4x8 foot sheet of the
>> plastic.
>>
>> HDPE cutting boards are readily available in a variety of useful sizes,
>> and are cheap. There are also polycarbonate cutting boards.
>>
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