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Re-mounting an RV-6

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#1 Rand Barthel

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Posted 18 January 2013 - 09:23 PM

I have a ca. 1970 Criterion RV-6 reflector with the original equatorial mount. The OTA attaches to the mount via two rings around the tube and a pair of 1/4" bolts that bolt to a metal saddle.

Someone on these forums suggested I could re-mount the scope on a go-to mount like an Orion Sirius or maybe a CG-5. Those all seem to attach to a scope by means of a Losmandy or Vixen dovetail rail. Does anyone have any experience adapting an RV-6 to that type of mounting attachment?

#2 Mirzam

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Posted 19 January 2013 - 07:00 AM

What you want to do is very easy. Just cut a strip of 3/4" plywood to span the RV-6 mounting rings and attach the dovetail (I would use Losmandy if possible) to the other side of the plywood adapter. You can use through-bolts to attach the dovetail as long as you avoid the area where the rings mate to the upper plywood surface. You can also change the ring spacing on the OTA to work with whatever hole spacing is available on the dovetail.

JimC

#3 Rand Barthel

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Posted 19 January 2013 - 12:28 PM

Sounds good to me. Thanks!

#4 Mr Magoo

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Posted 19 January 2013 - 01:36 PM

Picture of one. Remounted RV-6

#5 Meadeball

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Posted 21 January 2013 - 05:29 PM

You have to join that group to be able to get to the link.

#6 Mr Magoo

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Posted 21 January 2013 - 07:36 PM

It's free to join.

#7 Startraffic

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Posted 22 January 2013 - 07:49 AM

Mr. Magoo,
I already have 4 pages of groups, thanx but no.

Clear Dark Skies
Startraffic
39.138274 -77.168898

#8 Jon Isaacs

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Posted 22 January 2013 - 08:41 AM

Jim:

Why not just bolt the rings directly to the dovetail? One might want to drill holes in the dovetail but I don't see the reason for the plywood.

A Vixen dovetail should be fine, RV-6 otas weigh about 8 lbs. A CG-5 should be plenty sturdy, I found the EQ-3 was similar to the stock mount.

Also, I believe the bolts are 5/16" rather than 1/4", at least mine is. when I mounted it on my EQ-3 which doesnt use a Dovetail, I had to drill out the holes to 5/16".

Jon

#9 Mirzam

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Posted 22 January 2013 - 09:07 AM

Sure. No reason not to do it this way as long as your dovetail is long enough to give good ring separation. I would rather use a Losmandy type dovetail to get the wider mating surface. But as you say the RV-6 OTA is so lightweight that it probably doesn't matter which dovetail type is used.

With the plywood adapter approach there are fewer new holes needed in the dovetail itself, possibly making it easier to re-use the dovetail on other scopes.

JimC






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