How do I adjust rotation with discrete stops? - Router Forums
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post #1 of 18 (permalink) Old 05-24-2020, 11:40 PM Thread Starter
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Default How do I adjust rotation with discrete stops?

Hi all.

I made this driveway mirror and mounted it to a post. I needed to be able to adjust its tilt and rotation a bit with the mirror in position, then lock it securely at the correct angle.

I tried to use pipe fittings with locking collars (picture attached), which worked for a while but continually moved with wind despite being secured with "permanent" threadlock.

So what I think I need is metal discs with holes through them, which can be rotated in relation to each other then locked in place with a pin. Almost like a super-robust lazy-suzan bearing with discrete stops. They use large versions of what I'm talking about on exercise machines, to adjust the position of armatures for different-sized people. I tried searching using relevant terms but haven't found anything. Maybe I just don't know what they're called. Any suggestions?

I'd make something myself, but I don't have the necessary tools to cut and drill through steel discs.

Thanks!
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post #2 of 18 (permalink) Old 05-25-2020, 02:13 AM
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thoroughly clean then put locktite on all of the treads....
use the unions for the rotation,,
rubber cement the union flanges...
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This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

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post #3 of 18 (permalink) Old 05-25-2020, 03:01 AM
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@Stokestack ,
Gavin, unless you plan to re-adjust the mirror, have you considered drilling through each joint, flange and union, and driving in a nail or a self-tapping screw? At most it might cost you a metal-cutting drill bit.
As far as I know, threadlock is designed to break with sufficient load - I believe it is meant to prevent unthreading due to vibration.
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post #4 of 18 (permalink) Old 05-25-2020, 03:35 AM Thread Starter
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Thanks for the replies.

I might be able to drill through the joints... I guess it's a reasonable idea. I have metal bits.

I also have some 3M panel-bonding cement, which might be strong enough for this application.
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post #5 of 18 (permalink) Old 05-25-2020, 04:36 AM
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locktite red or gray will keep the threads from turning unless you demand it...
you will need to clean the threads 1st...

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
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post #6 of 18 (permalink) Old 05-25-2020, 04:45 AM
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why not use an automotive/truck mirror bracket...
there are a zillion bracket assemblies to choose from...
https://www.iowa80.com/browse/bracke...MIRRBRCKT/UNI/

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This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
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post #7 of 18 (permalink) Old 05-25-2020, 05:55 AM
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I think you might be able to do what you want by moving the horizontal mount to the center of the left stile (as viewed in the picture). If need be make the vertical pipe taller. By centering the horizontal mount to the mirror you will distribute the weight more evenly and it should not tilt once positioned.

If you have access to drill bits and taps you could drill and tap a hole in the female joints and put a screw in against the male threads.

You could also consider eliminating some of the joints and using only straight pipe between the elbows...

...more ideas after coffee...
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post #8 of 18 (permalink) Old 05-25-2020, 09:53 AM
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Get a good pipe wrench and tighten all the joints like they should be tightened and I don't think you would get all the movement problems. If part of the problem is people running into the mirror and knocking it out of alignment then drilling the joints and adding screws after adjusting the mirror should help but might hurt someone if it will not give when hit.
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post #9 of 18 (permalink) Old 05-25-2020, 10:27 AM
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Quote:
Originally Posted by Stokestack View Post
Thanks for the replies.

I might be able to drill through the joints... I guess it's a reasonable idea. I have metal bits.

I also have some 3M panel-bonding cement, which might be strong enough for this application.
just a thought what if you drilled at the joints and threaded the holes for set screws then you could still adjust them if needed. I also like sticks idea of using truck style mirror brakets. You could probably find something at a local auto salvage yard.

Last edited by roxanne562001; 05-25-2020 at 10:30 AM.
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post #10 of 18 (permalink) Old 05-25-2020, 11:14 AM
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Hey, Gavin; looking at the design two things strike me.
1) the horizontal arm is allowing the wind effect to add significant torque /leverage to the vertical joints portion. Maybe eliminate it? (as Nick suggested)
2) same problem for the low mounting position on the mirror; the mirror weight is acting against the joints in the horizontal portion. Move the attachment point to the middle of the mirror panel
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