Go Back   IceInSpace > IceTrade Classifieds > IceTrade Archives

 
 
Thread Tools Rate Thread
  #1  
Old 15-09-2012, 05:17 PM
DaveGee's Avatar
DaveGee (Dave Gault)
Occultation Observer

DaveGee is offline
 
Join Date: Aug 2006
Location: Blue Mountains, Australia
Posts: 232
14 1/2" Mirror Blank

Material = PLATE GLASS.
14 /1/2" (368mm) diameter x 25mm thick and has been hogged and smoothed to about a f4.6 curve (5mm deep).

Price - $120 + shipping

Shipping costs would depend on distance and weight. By the time I got it into a ply box and packed up snice'ntite, I guess it would weigh 10-12 kg. According to AusPost, that would be $22.35 (Melb or Bris), $25.95 (A'de), or $44.55 P'th). Of course pickup in The Blue Mountains or Aurburn would be fine.

Price drop to $80 + shipping.
Attached Thumbnails
Click for full-size image (14half-A.JPG)
190.1 KB108 views
Click for full-size image (14half-B.JPG)
171.3 KB103 views
Click for full-size image (14half-C.JPG)
196.1 KB135 views

Last edited by DaveGee; 04-10-2012 at 05:59 PM. Reason: Price Drop
  #2  
Old 04-10-2012, 06:01 PM
DaveGee's Avatar
DaveGee (Dave Gault)
Occultation Observer

DaveGee is offline
 
Join Date: Aug 2006
Location: Blue Mountains, Australia
Posts: 232
Price Drop - see above
  #3  
Old 17-10-2012, 09:47 PM
DaveGee's Avatar
DaveGee (Dave Gault)
Occultation Observer

DaveGee is offline
 
Join Date: Aug 2006
Location: Blue Mountains, Australia
Posts: 232
Quote:
Originally Posted by Handy Andy View Post
Dave... just wondering, is the mirror a reasonably accurate spheroid?
Hi Andy,
I didn't do the hogging or start the fine grinding so I can't comment on the tool/mirror match but the surface does appear smooth and even. I'd guess it's a good spheroid. There is a lot of work to do before it's ready to polish.
  #4  
Old 17-10-2012, 09:49 PM
DaveGee's Avatar
DaveGee (Dave Gault)
Occultation Observer

DaveGee is offline
 
Join Date: Aug 2006
Location: Blue Mountains, Australia
Posts: 232
Someone who's mailbox is full asks in a PM...
-How much do you reckon would be involved to finish of the mirror? Or would it be too big a job for a first project for me?

Hi,

If you have never made a 6" or 8" mirror before, then you'd be looking at a very steep learning curve to climb to turn this blank into an astronomical objective. Not an impossible task for someone patient and determined, perhaps with a knowledgable friend who can give in-person advice, or even a helpful online forum to guide you...
 

Bookmarks

Tags
blank, mirror, telescope

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 12:09 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement
Testar
Advertisement