Main Menu

ATM
Automated Obs
WebCams
Sports Cars
Music
Froggy
FAQS
Gallery
Links
About Me
SpaceCam
Dobsonian
 

Section

Mirror Grinding
Mirror Figuring
Mirror testing
Mirror Cell
Focuser
Filters
De Rotation
Counter Weight
Drive

 

 

 

 

 

 

  

The most active and innovative astrophotography forum in the world! 

Join QCUIAG today.

 

 
Counter Weight

Back Up Next

In order for the dome to be as small as possible and also so eyepiece height changes as little as possible the alt bearings are midway along the telescope tube. This makes the telescope very bottom heavy. The counter weight needed was 8kg at the top of the tube. This was archived by casting a lead ring. I received lots of advice on lead casting from the ATM list. Possibilities offered included molding lead shot in epoxy resin.
The method I went with was described by Pete Brooks . I bought the lead from a local scrap metal merchant. It had been used for roofing. A plywood mould was made and the lead melted in 4 lots using a coal/wood fire then poured in to the mould, It took a fair bit of heat to melt 8kg of lead but the casting went pretty smoothly. The resulting ring has a few bubbles in it but still does the job.

 

leaf

The Poor Meadow Dyke Galleries are now open.  

THE GALLERIES

 

 

See the full range of Atik cooled CCD cameras for astronomy on the Atik Website

 


Copyright 2006 Steve Chambers. All Rights  Steve@pmdo.com

  Back Up Next