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Author Topic: Potential Observatory Project  (Read 6230 times)

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Offline tomhow

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Re: Potential Observatory Project
« Reply #15 on: 19:51:56, 13 September, 2015 »
Mixer for sure... amazing how much concrete these things swallow!
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Offline mechanoid

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Re: Potential Observatory Project
« Reply #16 on: 19:48:52, 14 September, 2015 »
Have you thought about getting ready mixed ?  You'll probably need between 2 and 4 tons, which is an awful lot of material to hump about and get up into the mixer.  With one helper I wheelbarrowed in (couldn't pour direct) 3 tons in half an hour, over a level distance of about 40 metres.  I found a local handyman who had an account with a mix firm, and he arranged it and helped out for a small fee.  Pouring, floating and cleaning up - job done inside an hour and a half.
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Offline peterr

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Re: Potential Observatory Project
« Reply #17 on: 19:50:36, 21 September, 2015 »
Ok, so not an galaxy or nebula but it's a dug out hole and ready for concreting.  It ended up 2 x 2.5 x 3 deep, maybe thinking ready mix just not sure if access will be possible.

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Offline tomhow

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Re: Potential Observatory Project
« Reply #18 on: 19:54:55, 22 September, 2015 »
That is a superb looking hole in the ground - well on the way!!
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Offline peterr

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Re: Potential Observatory Project
« Reply #19 on: 18:43:38, 09 October, 2015 »
Concrete is in.  With the mixer and 2 friends we were done in 35 mins on the pour, it took longer to clean up!.  Base does not need to look pretty or framed as I will cover over it with some shingle then build the frame of the obsy around it.  Minimal cost is most important here (more money towards scopes etc) so I ended up with a 3000mm x 200mm (7.87 inch) ducting pipe which was £26 including free delivery from fleaBay.  Pipe was then cut to size.
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Offline Atik Man

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Re: Potential Observatory Project
« Reply #20 on: 01:28:45, 10 October, 2015 »
Make sure you put some thick weed control material down before slapping on the shingle. You won't want to create an environment under your observatory for rodents to thrive. Also add rock salt to your shingle to act as a inhibitor to both weeds and creatures.
Looks a sturdy pier, but how you going to attach your mount? I can't spot any bolts??

Offline peterr

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Re: Potential Observatory Project
« Reply #21 on: 09:05:19, 10 October, 2015 »
Good spot on the bolts, the l-type bolts didn't arrive in time.  The concrete mixer I had access to was free of charge, I just got caught out with it arriving yesterday when we planned it for next weekend so it just means i will have to sink long anchor bolts instead in a few weeks once it's cured.  Not the way I wanted to do it, however given the cold freezing weather due in 2 weeks I am glad it's now in.  Adapter plates are in fabrication with a local metal works company, pier mix was 1 part cement to 4 ballast so really strong, some rebar down the tube and into the clay for good measure. 

Appreciate the tips on the shingle, i'll make a note to do that.
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Online chris.bailey

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Offline peterr

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Re: Potential Observatory Project
« Reply #23 on: 10:07:49, 10 October, 2015 »
Thanks Chris!.  I knew I needed some resin for the bolts & holes, you have saved me figuring out which!
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Online chris.bailey

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Re: Potential Observatory Project
« Reply #24 on: 11:08:40, 10 October, 2015 »
Peter

I tightened the bolts to the baseplate of the pier first and then dropped all 8 into the resin filled holts and shimmed it so the baseplate was level (ish) before the resin set. I also put some "blobs" of resin under the baseplate itself so when it set (10 minutes max) the whole thing was bolted down and supported over most of the plate. Bottom line was it stuck so well to the baseplate that I now couldn't get it off even if I wanted to.

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Offline Roger B

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Re: Potential Observatory Project
« Reply #25 on: 17:05:48, 10 October, 2015 »
Thats the stuff my Builder mates used when intaliing my pier.


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Offline peterr

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Re: Potential Observatory Project
« Reply #26 on: 18:04:15, 10 October, 2015 »
Just so I am clear with the resin, you don't fill the hole and then screw the anchor bolts in, you fill the hole with the resin and just need to drop the bolts in?.  The resin is that good?
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Offline MikeDunn

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Re: Potential Observatory Project
« Reply #27 on: 19:25:31, 10 October, 2015 »
If it's like the resin I used for the fence-posts into the wall (also from SFD) ... just needs about a third to half the depth of the hole; the bolts push the remnants up & completes the bond.

Only had it in 6 months so far, so yet to test a winter ...
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Online chris.bailey

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Re: Potential Observatory Project
« Reply #28 on: 20:30:26, 10 October, 2015 »
Just so I am clear with the resin, you don't fill the hole and then screw the anchor bolts in, you fill the hole with the resin and just need to drop the bolts in?.  The resin is that good?

Make sure you clean the holes out really well, half fill with resin and then drop the bolts in and give them a bit of a shuffle to expel any air bubbles. Will be set in about 20 minutes and pretty much at full strength within the hour so not much time to rectify mistakes.
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Offline Nomis Elfactem

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Re: Potential Observatory Project
« Reply #29 on: 19:57:52, 11 October, 2015 »
That's the stuff P-bolts are fixed into the rock used for caving rigging... I've hung several hundred feet, free-hanging on a 10mm bolt, held in with that stuff... rock hard !!

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