solarmax II

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alpha76
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solarmax II

Post by alpha76 » Sat Jul 25, 2020 2:14 am

Good morning all

Here I have a Coronado Solarmax II 90 and I would like to change the plastic screws of the BF as well as on the eyepiece holder with metal screws
Do you have an idea?

thank you
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Re: solarmax II

Post by marktownley » Sun Jul 26, 2020 9:45 am

Just measure them, they will be a standard size, probably m4?


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Re: solarmax II

Post by Rusted » Sun Jul 26, 2020 12:08 pm

Be aware that metal screws may damage the cosmetics of your attached equipment. Eyepiece barrels, diagonals, etc.
Metal screws with plastic points are available. Matching threads exactly may also be a problem.

All screws threads are subject to tolerances in [usually CNC] manufacture.
The thread cutting tap in the machine should be changed to a new one at intervals. But when? Who decides?

I have a small collection of thumbscrews which I use for multiple, radial screws in receptacles for a more secure grip.
Though I have several different thread cutting taps, for each thread size, the difference in fit can often be dramatic.
The screw falls out or is far too tight without further work. There is often a very fine line between the degree of fit.

Fully inserting a 1st [tapered] cutting tap in the screw hole is often disastrous! The screw fit will be far too loose.
The metals used in fittings aren't always the finest material to support a new thread.

Astro suppliers sell thumbscrews. As do others on eBay, etc.

Too much information but it may be useful to somebody. ;)


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alpha76
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Re: solarmax II

Post by alpha76 » Fri Jul 31, 2020 6:40 am

With you a thread reference



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