[Leo.G (Leo)]

Thank you yet again!


rbronca I've seen a lot written on extremely complex means of doing this and that's why I asked here, I didn't understand most of it. I have several refractors and several cats and no matter how I store my telescopes and I vacuum daily cat hairs find their way into the optics. For purely visual an occasional cat hair in the optics is fine, if I'm imaging they are not and I take great care with my Nikon optics, particularly the sensor when changing lenses.
They are all Achromats so nothing hugely expensive and I'd be less prepared to strip the lens out of something worth a lot of money but they are what I can afford I'd just like to do a quick check particularly on the `152 mm unit.


In regards to the mention of using my laser in a V block to check the accuracy, I have a couple I have no idea where I've put them.
I tried the lathe, the 3 jaw chuck has minimal run out but too much to give me accuracy to check whether the lasers are square. One laser does have two collimation adjustments I haven't played with.
I have a 4 jaw chuck if I could be bothered fitting it, the thing is heavy and last time it dropped on my fingers I remembered for quite a while. The 4 jaw and dial gauge will give me a high level of accuracy over a few feet (the length of the bed) but yes, a V block would be better if I can find the things and use a distant target. I can't find my aluminium 7075 40mm rod to machine an adapter anyway but I've contacted a company in Minto a local engineer buys his alloy from to see if I can get a few shorter pieces cheap enough for what I have to machine up. I have steel but I prefer the alloy weight factor playing with telescopes.