![]() ![]() (That's all that is available here locally.) I have not used UltraCal 30 but do use UltraCal 105 which is very similar. Usg-ultracal-30-southard-submittal-en-IG1939.pdf 234.01KB 20 downloads Joe at Parallax Instruments said he could easily modify his 12.7" ID tube rings to fit the Public Missiles tube, once I receive it and know exactly what the delivered OD is.Īdvice on using Ultracal 30 on BK7 and anything to watch out for, anyone? I've already ordered the 12.61" ID CF tube, 0.12" wall thickness, 44" long from Public Missiles, Inc. The focal length should come out to around 260" but can be adjusted toward the end to mate the BFL well with the Starlight Instruments FTF2535HD focuser. This is going to be a sweetheart Planet Killer scope. But advice from experienced folks here is worth much more. I'm first going to mix up a test batch in a paper cup with a thermometer in it and track the temperature during curing. Leave it too long and the glass could break from rapidly rising temperature. My question is, does anyone here have experience with pouring Ultracal 30 on BK7 to make grinding tools? Does the temperature rise during curing pose any fracture danger to the glass? How quickly do you need to get the corrector shell off the plaster? Pull it too soon and the mold won't stay the right shape. The US Gypsum datasheet is attached, and has one quote in the Product Information section that worries me: "When mixed with water, this material hardens and becomes very hot sometimes quickly." I haven't used Ultracal 30 before, but am aware that as plaster cures it gets hot. The corrector is BSC-2 glass, very similar to BK7. I just ordered some Ultracal 30 from Amazon to make grinding tools for my 10.4" Maksutov. ![]()
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