Truss connectors?

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Erik
Post subject: Truss connectors?
Posted: Mon Jul 16, 2018 9:47 am
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After getting my mirrors recoated, I’ve been reworking my16” dob and fixing some things that bother me. One if them is how the wooden truss poles I use have “compressed” on the upper ends so that they are slipping out of the clamps. I need a better solution and was thinking about a plastic or aluminum end that would work better with the Moonlite compression clamps. The bottom ends use ball connectors so they aren’t a problem. I’d like to keep the current compression connectors on top and they’re 1” poles. Anyone have a source for anything that might work?

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Chopin
Post subject: Re: Truss connectors?
Posted: Mon Jul 16, 2018 1:18 pm
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Pics!

I think I understand your dilemma, but before I offer suggestions I'd love to wrap my brain around the design.

Have you considered moving to a traditional aluminum pole altogether?

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Erik
Post subject: Re: Truss connectors?
Posted: Mon Jul 16, 2018 9:29 pm
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Thanks Jason; I thought about it but the ball ends on the bottom work really well so if there’s a connector solution I’d rather keep the wooden poles.

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-Erik Wilcox
Homebuilt 16" Truss Dob
8" Antares f/5 Newt
SV 80mm ED Nighthawk NG on M1 ALT/AZ
Nikon Prostaff 65mm spotter on Trekpod
Konusvue 20x80 binos/Peterson PipeMount


"Newt Gingrich is what stupid people think smart people sound like."
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Evolution is both fact and theory. Creationism is neither. -Anonymous


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Chopin
Post subject: Re: Truss connectors?
Posted: Tue Jul 17, 2018 2:16 pm
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Cool. I pass absolutely no judgement on your design reasoning. I often forge designs that are slightly against the grain.

At any rate, is it possible for you to post a close-up picture of the clamp end of the pole and the clamp itself?

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Chopin
Post subject: Re: Truss connectors?
Posted: Tue Jul 17, 2018 2:26 pm
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I'm just trying to understand why it's slipping.

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Chopin
Post subject: Re: Truss connectors?
Posted: Tue Jul 17, 2018 2:27 pm
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To clarify, in case you are not getting this, I am dumb as nuts.

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Erik
Post subject: Re: Truss connectors?
Posted: Fri Jul 20, 2018 9:51 pm
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:lol:

Hardly. It’s hard to visualize without a photo. I’m just lazy lol. Here you go; it’s just compressing the poles.

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-Erik Wilcox
Homebuilt 16" Truss Dob
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SV 80mm ED Nighthawk NG on M1 ALT/AZ
Nikon Prostaff 65mm spotter on Trekpod
Konusvue 20x80 binos/Peterson PipeMount


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Chopin
Post subject: Re: Truss connectors?
Posted: Sat Jul 21, 2018 6:08 pm
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Okay. So is it that the wood has worn down and no longer makes enough contact?

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Erik
Post subject: Re: Truss connectors?
Posted: Sun Jul 22, 2018 9:49 am
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Yes, the wood is compressed and slightly graduated at the ends so that it tends to slip out. I may just give in and order the aluminum poles. Might just be the easiest option at this point.

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-Erik Wilcox
Homebuilt 16" Truss Dob
8" Antares f/5 Newt
SV 80mm ED Nighthawk NG on M1 ALT/AZ
Nikon Prostaff 65mm spotter on Trekpod
Konusvue 20x80 binos/Peterson PipeMount


"Newt Gingrich is what stupid people think smart people sound like."
-The Great Paul Krugman

Evolution is both fact and theory. Creationism is neither. -Anonymous


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Chopin
Post subject: Re: Truss connectors?
Posted: Mon Jul 23, 2018 9:10 am
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They aren't cheap, although I recommend looking into buying direct from an aluminum extruding company. I imagine you can save a reasonable amount. You can also specify different thickness tubes (thus varying weights), in the off chance that your scope is already balanced perfectly to the wooden poles, which I gander are fairly heavy.

I thought about the idea of a connector at the end. I'm not certain what you were thinking, but if you are considering cutting off the wooden ends and replacing, that would leave you with two pieces attached by a fastener, such as a screw or bolt. I mention it that way because your truss is only as strong as the weakest link, in this case the bolt. You could probably get away with this by procuring a single piece of aluminum tube with a thick sidewall, cutting eight short pieces, tapping each with thread tap, and bolting the ends directly into the wooden pole ends, again by using a bolt with a healthy diameter to maximize strength. If that doesn't make sense, I can craft a few drawings. Might save you even more money in the end. And knowing that you enjoy building things, it might be fun.

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Chopin
Post subject: Re: Truss connectors?
Posted: Mon Jul 23, 2018 9:18 am
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onlinemetals.com

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Chopin
Post subject: Re: Truss connectors?
Posted: Mon Jul 23, 2018 9:20 am
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What's the tube diameter?

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Erik
Post subject: Re: Truss connectors?
Posted: Thu Jul 26, 2018 11:46 pm
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Wow, thanks Jason! The tube diameter is 1”. The ball ends I currently have are attached to a PVC adapter of some sorts (it’s been so many years since I built it that I can’t renember where I got it from). So I think I could simply insert the new poles into the PVC adapter and then on top use the same compression style truss holders.

Getting the poles locally might be the hard part; I think if I ordered them online it may be easier as long as they shop to Hawaii. I’ll check out that link you provided. Thanks again! Been super busy but I can’t wait to get first light with the recoated mirrors and (hopefully) improves truss system.

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-Erik Wilcox
Homebuilt 16" Truss Dob
8" Antares f/5 Newt
SV 80mm ED Nighthawk NG on M1 ALT/AZ
Nikon Prostaff 65mm spotter on Trekpod
Konusvue 20x80 binos/Peterson PipeMount


"Newt Gingrich is what stupid people think smart people sound like."
-The Great Paul Krugman

Evolution is both fact and theory. Creationism is neither. -Anonymous


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Chopin
Post subject: Re: Truss connectors?
Posted: Sat Jul 28, 2018 6:03 am
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PVC adaptor...brilliant! Way simpler, I like it. You could get solid aluminum rod with a 1" O.D. as the extension.

1 inch Aluminum Round Rod

And yes, they ship to Hawaii.

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Chopin
Post subject: Re: Truss connectors?
Posted: Sat Jul 28, 2018 6:05 am
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You could also do aluminum pipe in place of PVC. I think they sell the 1" I.D., with a nominal average of about 1.04". PVC would probably work fine, though.

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Erik
Post subject: Re: Truss connectors?
Posted: Sat Jul 28, 2018 10:17 am
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Thanks Jason. Going to try and figure something out this weekend. We just bought an old Jeep (4WD trips to the beach) so that’s been taking my free time.

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-Erik Wilcox
Homebuilt 16" Truss Dob
8" Antares f/5 Newt
SV 80mm ED Nighthawk NG on M1 ALT/AZ
Nikon Prostaff 65mm spotter on Trekpod
Konusvue 20x80 binos/Peterson PipeMount


"Newt Gingrich is what stupid people think smart people sound like."
-The Great Paul Krugman

Evolution is both fact and theory. Creationism is neither. -Anonymous


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Chopin
Post subject: Re: Truss connectors?
Posted: Sun Jul 29, 2018 4:16 pm
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The Jeep sounds awesome! What model/year did you get?

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Erik
Post subject: Re: Truss connectors?
Posted: Mon Jul 30, 2018 9:22 pm
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1998 Wrangler. Only 97K miles but it seems like they’ve been hard island miles! Runs good though and we got it for a ridiculous price since the person selling it was moving off the island.

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-Erik Wilcox
Homebuilt 16" Truss Dob
8" Antares f/5 Newt
SV 80mm ED Nighthawk NG on M1 ALT/AZ
Nikon Prostaff 65mm spotter on Trekpod
Konusvue 20x80 binos/Peterson PipeMount


"Newt Gingrich is what stupid people think smart people sound like."
-The Great Paul Krugman

Evolution is both fact and theory. Creationism is neither. -Anonymous


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Erik
Post subject: Re: Truss connectors?
Posted: Mon Jul 30, 2018 9:24 pm
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Here it is on our first beach trip the other day. It’s pretty fun bouncing down the lava roads where we live.

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-Erik Wilcox
Homebuilt 16" Truss Dob
8" Antares f/5 Newt
SV 80mm ED Nighthawk NG on M1 ALT/AZ
Nikon Prostaff 65mm spotter on Trekpod
Konusvue 20x80 binos/Peterson PipeMount


"Newt Gingrich is what stupid people think smart people sound like."
-The Great Paul Krugman

Evolution is both fact and theory. Creationism is neither. -Anonymous


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Chopin
Post subject: Re: Truss connectors?
Posted: Wed Aug 01, 2018 3:03 am
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Fantastic! Looks like a hellafun! Man, I want a truck. :cheesygrin:

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Erik
Post subject: Re: Truss connectors?
Posted: Thu Aug 02, 2018 6:30 pm
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Yeah, it’s not a luxury ride, that’s for sure! But it handles the big lava rocks pretty well.

I still haven’t had time to work on the scope. Either I’m busy or just lazy!

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-Erik Wilcox
Homebuilt 16" Truss Dob
8" Antares f/5 Newt
SV 80mm ED Nighthawk NG on M1 ALT/AZ
Nikon Prostaff 65mm spotter on Trekpod
Konusvue 20x80 binos/Peterson PipeMount


"Newt Gingrich is what stupid people think smart people sound like."
-The Great Paul Krugman

Evolution is both fact and theory. Creationism is neither. -Anonymous


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Chopin
Post subject: Re: Truss connectors?
Posted: Fri Aug 03, 2018 2:46 pm
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:lol:

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