Challenger 2

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Rob
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Re: Challenger 2

Post by Rob » Wed May 04, 2016 1:01 pm

A tame engineer is just what I have locally, not the fastest turnaround on bits I need, but over the last 16 years he has rendered bits for 1/8 Chally 1, numerous warships and five 1/1 sized trikes for me. I think I will be paying for his retirement.

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AndyR
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Re: Challenger 2

Post by AndyR » Wed May 04, 2016 9:47 pm

Hi all,

I'd be up for a set if your looking for people to help make up an order ;)

Cheers
Andy
Happy, Happy, Joy, Joy, Happy, Happy, Joy, Joy...........

Rob
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Re: Challenger 2

Post by Rob » Thu May 05, 2016 8:27 am

I won't have time to get to see him today, but sometime this week I will go and chat to him.
What diam are your track link pins Andy, mine are older and measure 2.97 mm, I'd guess they are 3mm nominal best russian bicycle spokes.
I have sourced bike spokes ( nipple end on outside of links ? ) for an earlier project, that I can get in imperial or metric sizes and any lengths, at a good price. Threads can be rolled/cut at the factory, any ideas as to how to finish the inside ends for fixing ? The russian method of hitting the end to a bend doesn't appeal too much.
Or do we go the Armortek route with pins,washers and circlips ?

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AndyR
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Re: Challenger 2

Post by AndyR » Thu May 05, 2016 2:32 pm

Hi Rob,

To be honest I was thinking about the track links last night.

I reckon it would be easier to design a split link and cast from Brass, then fit with something like a 3mm caphead screw between the half shells. Something more prototypical.

It would reduce the cost of the links I think, and we could make in brass or aluminium, you could undersize the half holes so it nips the shaft.

The cap head screw could be threaded into the brass or better yet design a nut that can be manually inserted to the half shell.

Trouble is where do you draw the line, you'd be as well designing a new lower hull and add suspension detail and idler adjustment details......

It needs some careful thought before we approach somebody - 3d print perhaps?

Cheers
Andy
Happy, Happy, Joy, Joy, Happy, Happy, Joy, Joy...........

Rob
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Re: Challenger 2

Post by Rob » Fri May 06, 2016 2:19 pm

Andy I was looking for a simple solution lol.
My engineering fella is looking at drawing up replacement end caps this weekend, the link pins will be around £27 per hundred, with one end threaded for a nyloc nut, the other a flat head.
More as I get it.

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AndyR
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Re: Challenger 2

Post by AndyR » Fri May 06, 2016 3:41 pm

:D I'll be in for that price.............

Cheers
Andy
Happy, Happy, Joy, Joy, Happy, Happy, Joy, Joy...........

Rob
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Re: Challenger 2

Post by Rob » Tue May 10, 2016 4:25 pm

My engineering machinist bod has done a drawing in CAD something or other, direct replacement of the track joiner ends.
If the central units are kept as the original russian ones ( we are doing exact copies in ally) the outside ones could be beefed up from the russian 8.5 mm to 10mm width ?
He is taking around 150 for 550 at the moment.
He also can do 3mm stainless pins with.8 mm circlips and washers, or threads on 3mm flat headed pin (for washer and half nut or nyloc)
Your thoughts please gents.

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AndyR
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Re: Challenger 2

Post by AndyR » Tue May 10, 2016 10:17 pm

Sounds great to me.

Suggest getting a small batch of say 10 made and trial it first?

But if successful I'm up for it I think.

Cheers
Andy
Happy, Happy, Joy, Joy, Happy, Happy, Joy, Joy...........

Rob
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Re: Challenger 2

Post by Rob » Tue May 10, 2016 10:59 pm

That was my thought Andy.
I've got 6 spare sections, I thought I'd set those up, join them into my track and give them a running test. ( sound, vibration mesh with the sprocket etc )

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AndyR
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Re: Challenger 2

Post by AndyR » Fri May 13, 2016 10:46 pm

Sounds like a plan.

I'm up for a set assuming they work as good or better than the originals.

Was it £150 for a set of 550?

Did I understand that correctly?

PS any pics of the modified links would be good ;)

Cheers
Andy
Happy, Happy, Joy, Joy, Happy, Happy, Joy, Joy...........

Rob
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Re: Challenger 2

Post by Rob » Fri May 13, 2016 11:17 pm

Work is in hand Andy, more news when it happens,

Rob
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Re: Challenger 2

Post by Rob » Wed May 18, 2016 1:15 pm

Ok, I'm having a test run done on new link pieces ,alloy 'clamps' ( one piece, three per joint) stainless pins, washers and circlips made up.
I'm going to use them to replace a couple, and add a couple of track links to my Chally.
I will test them before I let you know the price . . . . It's not turned out particularly cheap, nothing over engineered normally is I guess.
More after testing.

Rob
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Re: Challenger 2

Post by Rob » Sat Jul 30, 2016 9:59 am

We have machined the link pieces, experimented with SS pins with circlips ( with some success ) but I'm going to try SS headed pins with aerotight nuts and washers as an alternative and simpler ( cheaper) method.
Must admit that body mods have ground to a halt whilst im messing about with the track bits. ( might be due to the purchase of a couple of new guitars as well ! )
Anyone got a decent sound clip of a Challenger 2 start up for a new soundcard ?

Rob
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Re: Challenger 2

Post by Rob » Wed Aug 17, 2016 8:03 am

After yet more trials ( and tribulations ) hopefully this weekend I will be testing the new, hopefully final link joiners.
Machined alloy countersunk on the outers and threaded on the inners, stainless 3.2mm pins and a lock nut.
So far these are working the best
They certainly look the part now, time will tell.
Next job a full set of engine grilles milled in alloy.

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AndyR
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Re: Challenger 2

Post by AndyR » Thu Aug 18, 2016 12:19 pm

Alloy engine grills, now that's cool :geek:

Track pins sound great, any chance of a pic or two?

Cheers
AndyR
Happy, Happy, Joy, Joy, Happy, Happy, Joy, Joy...........

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