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Equipment Discussions >> ATM, Optics and DIY Forum

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Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: so the wife and kid are away... new [Re: starman345]
      #5551667 - 12/03/12 08:48 AM

Quote:

So you are putting the HO mirror in a sling on this frame? Will it have a Howie Glatter type sling, or something else?




I'll try to make a combination.
$179 for harden shafts and linear bearings is too much for me.

the mirror is light enough so I'll try a delrin bearing on a shoulder bolt with a fabric sling velcro to the mirror.

if that doesn't work I'll make my own cable using the 18-8 shoulder bolts/linear bearings. The s.s. bolts are not hard enough for the linear bearings. They will fail but since the sliding back and forth is not very frequent, I believe I can get away with the 18-8 shoulder bolts for a couple of years.



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Mirzam
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Reged: 04/01/08

Loc: Lovettsville, VA
Re: so the wife and kid are away... new [Re: Pinbout]
      #5552272 - 12/03/12 03:27 PM

Hi Danny,

What kind of primer is that and did you have to de-scale the metal surface first?

JimC


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Pinbout
Postmaster
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Reged: 02/22/10

Loc: nj
Re: so the wife and kid are away... [Re: Mirzam]
      #5552297 - 12/03/12 03:40 PM

the primer is from HD - their etching primer. I use to use a "real" acid etching primer from akzo nobel but didn't have access to it this time.

I had to knock off the splatter from the welds but the all the metal came to me very clean, not like typical angle steel.


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Pinbout
Postmaster
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Reged: 02/22/10

Loc: nj
Re: so the wife and kid are away... new [Re: Pinbout]
      #5555759 - 12/05/12 02:18 PM Attachment (8 downloads)

Ah Ha!

my roll of 4x8 .028 kydex finally arrived today from Interstate Plastics. They didn't even put it in a box or foam wrap, they just threw it in a plastic sack and ship it.


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starman345
Wait, I'm Thinking
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Reged: 07/06/10

Loc: New Brunswick, Canada
Re: so the wife and kid are away... new [Re: Pinbout]
      #5556164 - 12/05/12 06:38 PM

I checked their site, they have some pretty good prices, a lot less than I paid for my Protostar stuff although I don't know if it is comparable. Have you used it before?

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Mirzam
Post Laureate
*****

Reged: 04/01/08

Loc: Lovettsville, VA
Re: so the wife and kid are away... new [Re: starman345]
      #5556185 - 12/05/12 06:51 PM

Kydex has a matte black surface on one side, whereas the Protostar flockboard has a black velvet like surface. The flockboard is darker. Both have similar flexibility characteristics.

Kydex is a lot cheaper, and the first sheet I bought lasted a couple years. (All gone now though) I use flockboard when I want something to be really black.

The Kydex is great for baffles behind the mirror and large baffles opposite the focuser. The flockboard IMO is better for internal tube baffles and surface darkening.

JimC


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starman345
Wait, I'm Thinking
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Reged: 07/06/10

Loc: New Brunswick, Canada
Re: so the wife and kid are away... new [Re: Mirzam]
      #5556256 - 12/05/12 07:26 PM

Good to know, thanks Jim

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