Celestron EdgeHD 8 inch OTA

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Re: Celestron EdgeHD 8 inch OTA

Postby Carl-Ericsson » Mon Mar 26, 2018 5:12 am

Image

Well, as I said before, the two counterweights which came with my CG-4 mount (7 lb. & 4 lb.) are not enough to balance the 8" SCT, when I add on the weight of my Canon 1100D camera and other accessories. So, I got an extra counterweight which is designed for the Celestron Advanced VX mount. This counterweight weighs 11 lbs. Or, maybe 12 lbs. The "official" Celestron box it came in has "5.5 kg" printed on it, which is just over 12 pounds. I don't have a scale suitable for actually determining the weight, so I'll just have to guess from the two English measures quoted online for this counterweight, and the one Metric measure. Someday, I'll try to get access to a proper scale, and weigh it myself. So combined with the 4 lb. counterweight it should be more than adequate to balance everything. This counterweight was delivered to me a couple of days ago. The Secretary will disavow any knowledge concerning the rumors of a King's ransom being paid for this counterweight's safe delivery... :cool:

I thought it would be nice to post the major dimensions of this counterweight. So, in accordance with the letters found on the photo:

A = 21 mm
B = 31 mm
C = 145 mm (Measured with threaded lock rod in set position)
D = 127 mm
E = 148 mm

As for the thickness, F, there are really two important thicknesses to consider. Ummm… not so much stress on the word “important”, here! :lol:
First is the overall thickness, which is 47 mm. The second is the thickness measured along the portion of the central hole which is in contact with the counterweight shaft. This distance is 35 mm. So, the depth of the countersunk hole widening which allows for the counterweight to be extended beyond the end of the counterweight bar, stopped by the safety bolt on the end, is 12 mm.

The measurements A and B are accurate to within 1/2 mm, as measured using a small pocket caliper. The other measurements should be accurate to within about 1 mm, given the difficulty of measuring these distances without a large caliper, using only a ruler. Rounded edges, and all that… :))

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Last edited by Carl-Ericsson on Tue Apr 03, 2018 8:36 am, edited 1 time in total.
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Re: Celestron EdgeHD 8 inch OTA

Postby Carl-Ericsson » Tue Apr 03, 2018 8:30 am

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Re: Celestron EdgeHD 8 inch OTA

Postby Bill_P » Tue Apr 03, 2018 10:20 am

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Re: Celestron EdgeHD 8 inch OTA

Postby galileo » Tue Apr 03, 2018 8:37 pm

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Re: Celestron EdgeHD 8 inch OTA

Postby Carl-Ericsson » Wed Apr 04, 2018 6:18 am

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Re: Celestron EdgeHD 8 inch OTA

Postby Carl-Ericsson » Fri Apr 06, 2018 2:07 am

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Re: Celestron EdgeHD 8 inch OTA

Postby galileo » Fri Apr 06, 2018 8:20 am

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Re: Celestron EdgeHD 8 inch OTA

Postby Bill_P » Fri Apr 06, 2018 11:53 am

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Re: Celestron EdgeHD 8 inch OTA

Postby jjb2011 » Sat Apr 07, 2018 8:13 pm

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Re: Celestron EdgeHD 8 inch OTA

Postby Carl-Ericsson » Mon Apr 09, 2018 11:49 pm

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