On 2/23/2015 11:26 AM, Kirk Wallace wrote:
I need paintability to color the engraving. Bondabilty would be nice if
I need to build a complex lens holder from parts.
I could use aluminum or brass but I would need to treat or paint them to
get a flat black finish.
You could sandblast the
On 2/23/2015 9:46 AM, Kirk Wallace wrote:
I am using this site as a reference for making some telescope eyepieces:
http://home.fuse.net/astronomy/
Larry chose to use urethane to make the blanks for machining. My
experience with urethane is that recipes range from rubbery soft to
pretty darn
I am using this site as a reference for making some telescope eyepieces:
http://home.fuse.net/astronomy/
Larry chose to use urethane to make the blanks for machining. My
experience with urethane is that recipes range from rubbery soft to
pretty darn hard, but not fully hard. I need something
On 02/23/2015 10:46 AM, Kirk Wallace wrote:
I am using this site as a reference for making some telescope eyepieces:
http://home.fuse.net/astronomy/
Larry chose to use urethane to make the blanks for machining. My
experience with urethane is that recipes range from rubbery soft to
pretty
On 02/23/2015 10:26 AM, Kirk Wallace wrote:
On 02/23/2015 09:03 AM, Bari wrote:
... snip
How are you defining fully hard? Urethane's can easily be over Shored
D 90.
Common PVC pipe is too soft. The threads fold over with running a
fingernail over them. Phenolic is too hard, or rather
PS - I machine some rubbery plastic parts that have a durometer similar
to soft urethanes. I freeze the parts to make them harder, so they cut
instead of smearing and tearing.
On 02/23/2015 11:46 AM, Kirk Wallace wrote:
I am using this site as a reference for making some telescope
On 02/23/2015 09:03 AM, Bari wrote:
... snip
How are you defining fully hard? Urethane's can easily be over Shored
D 90.
Common PVC pipe is too soft. The threads fold over with running a
fingernail over them. Phenolic is too hard, or rather brittle, the
thread peaks break off. Although this is
Black Delrin (acetal) turns nicely and produces good threads. I've also
found that it can be sanded with a random orbital sander and 220 grit
paper to make a gorgeous matte finish that has a warm velvet feel that
also resists fingerprints. For round parts, you should be able to
create the
I use both Acetal and Delrin, in both white and black.
Machining a batch of Delrin parts for most of this week. Did some Acetal parts
last week. One-offs that turned into batches.
Delrin is a bit stronger, mechanically, and a bit more abrasion resistant, but,
for microscope parts, Acetal is
On Monday, February 23, 2015 03:29:26 PM Marcus Bowman wrote:
I guess you will need a matt black
finish, so the tip about producing a matt finish is useful. Acetal
will hold a decent cut thread.
Please bear in mind that the matt finish isn't the deadest black in
optical terms. In the tv
On 23 February 2015 at 22:26, Gene Heskett ghesk...@wdtv.com wrote:
The flat black used in optics where the real estate for the absorber is
not available still reflects 8 to 10% of the light that hits it.
http://en.wikipedia.org/wiki/Vantablack
--
atp
If you can't fix it, you don't own it.
On Monday 23 February 2015 05:36:50 pm andy pugh wrote:
On 23 February 2015 at 22:26, Gene Heskett ghesk...@wdtv.com wrote:
The flat black used in optics where the real estate for the absorber is
not available still reflects 8 to 10% of the light that hits it.
On 02/23/2015 02:26 PM, Gene Heskett wrote:
On Monday, February 23, 2015 03:29:26 PM Marcus Bowman wrote:
I guess you will need a matt black
finish, so the tip about producing a matt finish is useful. Acetal
will hold a decent cut thread.
Please bear in mind that the matt finish isn't the
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