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Curvature of the most recent C14 Edge HD castings

 

I'm putting it out to the user community:? The aftermarket radius blocks + dovetail (Losmandy & ADM) can't be used with the latest C14 EdgeHDs.? The reason is that the front casting has an angle or slight curvature to it.


I'm wondering if anyone here has the ability and competence to make the measurements on the new front casting and make them available in such a way (with a drawing, or in language a machinist understands) that would allow us to get the information to the after market parts manufacturers and get over this hump.? I don't think it's a simple diagonal line.??


thanks

Greg N
 

This is mostly to ack yours to this forum. But otherwise no to your question, I have no such dwgs or measurements.

Thanks for the alert.

Since I don't have a C14 Edge or mounting system I can only comment theoretically.
The connection btwn the dovetail plate and radius block is presumably solid. And the curvature is correct btwn the radius block's and tube's diameter? If so then tightening up the screws to the tube AFTER the dovetail and radius block are solid may still provide more than sufficient rigidity. In part because the psi btwn the block & tube, given the same tightening torque between them, would be so much greater, even though in less than perfect surface to surface contact.

There are so many other things that move so much (more), the main mirror being the worst, that any resulting movement the fault of a Losmandy-ADM system, might be difficult to isolate and quantify. jmo



On Friday, January 18, 2019, 02:28:49 PM CST, tim71pos@... [C14_EdgeHD] wrote:


?

I'm putting it out to the user community:? The aftermarket radius blocks + dovetail (Losmandy & ADM) can't be used with the latest C14 EdgeHDs.? The reason is that the front casting has an angle or slight curvature to it.


I'm wondering if anyone here has the ability and competence to make the measurements on the new front casting and make them available in such a way (with a drawing, or in language a machinist understands) that would allow us to get the information to the after market parts manufacturers and get over this hump.? I don't think it's a simple diagonal line.??


thanks

Greg N
 

¿ªÔÆÌåÓý

I have an earlier C14 Edge and had the same problem. With a lot of gentle maneuvering I was able to get a tight fit of the radius blocks with the losmandy rail and the tube. I considered taking the parts to a machine shop to have the holes bored out but it proved unnecessary. That was four years ago and everything works just fine. I was most concerned about deforming ?the tube and putting the optics out of alignment but that did not happen. The construct is absolutely rigid. ?Lou. ?


On Jan 21, 2019, at 12:42 PM, 'keithnk@...' keithnk@... [C14_EdgeHD] <C14_EdgeHD@...> wrote:

?

This is mostly to ack yours to this forum. But otherwise no to your question, I have no such dwgs or measurements.

Thanks for the alert.

Since I don't have a C14 Edge or mounting system I can only comment theoretically.
The connection btwn the dovetail plate and radius block is presumably solid. And the curvature is correct btwn the radius block's and tube's diameter? If so then tightening up the screws to the tube AFTER the dovetail and radius block are solid may still provide more than sufficient rigidity. In part because the psi btwn the block & tube, given the same tightening torque between them, would be so much greater, even though in less than perfect surface to surface contact.

There are so many other things that move so much (more), the main mirror being the worst, that any resulting movement the fault of a Losmandy-ADM system, might be difficult to isolate and quantify. jmo



On Friday, January 18, 2019, 02:28:49 PM CST, tim71pos@... [C14_EdgeHD] <C14_EdgeHD@...> wrote:


?

I'm putting it out to the user community:? The aftermarket radius blocks + dovetail (Losmandy & ADM) can't be used with the latest C14 EdgeHDs.? The reason is that the front casting has an angle or slight curvature to it.


I'm wondering if anyone here has the ability and competence to make the measurements on the new front casting and make them available in such a way (with a drawing, or in language a machinist understands) that would allow us to get the information to the after market parts manufacturers and get over this hump.? I don't think it's a simple diagonal line.??


thanks

Greg N
[email protected]
 

I found this, maybe this is what you are looking for.?

Greg S.
 

¿ªÔÆÌåÓý

Are they better than the last ones? ?I had to jimmy the last set to make them fit. ?Lou


On Feb 24, 2019, at 10:29 AM, gspakoski@... [C14_EdgeHD] <C14_EdgeHD@...> wrote:

?

I found this, maybe this is what you are looking for.?


Greg S.
[email protected]
 

That I do not know. But they are made by somebody besides ADM so maybe they have a different fit.

Greg S.
 

Hello

I just read this thread for the first time.? Has this issue been resolved?
If the curvature is truly compound as the original poster has suggested, using a conventional radius block might not be wise. Tightening down the fastener which held the radius block to the compound curvature of the casting would stress the fastener.? The radius blocks would be forced out of alignment.? The results would be unacceptable and probably just as bad as the cheap orange aluminum extrusion dovetail bar supplied with the OTA.

Best solution in my opinion would be rings and the best rings are Paramount, without a doubt.

Regards,

Frank

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