Chieftain MK11 build

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AndyR
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Re: Chieftain MK11 build

Post by AndyR » Sat Sep 24, 2016 4:56 pm

Thats, looks awesome.....

The splash of paint really brings it to life...

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

Rob
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Re: Chieftain MK11 build

Post by Rob » Sun Sep 25, 2016 10:27 am

Having seen this model in the flesh, it's really becoming a work of art !
The time and skill involved is amazing.
Keep it up Possum.

Rob
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Re: Chieftain MK11 build

Post by Rob » Wed Oct 26, 2016 5:48 pm

No new pics in a month ?

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possum
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Re: Chieftain MK11 build

Post by possum » Wed Oct 26, 2016 6:39 pm

Ok ,I know. :cry:

I have been doing some work on the Chieftain but its the dull stuff eg :like turning up brass end tubes for the front idlers & drive shafts for the sprockets. Its a collection of parts at the moment, but soon as I figure out how they go on to the tank I'll post some more photo's.

Hope to get some time to work on the tank tomorrow & Friday

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possum
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Re: Chieftain MK11 build

Post by possum » Sun Nov 06, 2016 5:50 pm

Ok, I'm very sorry in my delay in posting. :oops:

The bit of the Chieftain I'm working on at the moment took a lot more time & work than I had imagined but I now have two rear drive axels. And they have been locked onto the rear sprockets, fitted through bearings on the outside & inside of the rear hull, & managed to fit a rear drive sprocket onto the shafts for drive chains from the motors.
Due to the layout of the chieftain I had very little room for a drive sprocket & chain to fit. Using the smallest drive sprocket I could find that would fit onto a 10mm drive shaft, I managed to get the chain to run round it without interfering with the rear hull by just 2-3mm. It was looking as if I would have to grind into the rear hull for clearance...but I just got away with it. :o
Anyway some more photos, doesn't look like I've done much... most of the time was on the lathe machining shafts or drilling & tapping holes for grub screws... fitting & re-fitting until they ran true.

https://lh3.googleusercontent.com/3KUUN ... 98-h673-no
https://lh3.googleusercontent.com/Glf4T ... 00-h673-no
https://lh3.googleusercontent.com/g53-u ... 98-h673-no
https://lh3.googleusercontent.com/2pwSG ... 05-h673-no
Saddle bearings bolted to rear hull for rigidity.
https://lh3.googleusercontent.com/5Whth ... 36-h673-no
Small sprocket fitted, tapped hole with threaded grub screw locking it into position.
https://lh3.googleusercontent.com/N-IPw ... 03-h673-no
I need slight alinement adjustment with the motor sprockets & I need to test the final speed. I have a smaller & larger sprockets for the motors to adjust drive speed.
https://lh3.googleusercontent.com/IL31G ... 05-h673-no
https://lh3.googleusercontent.com/PD1wf ... 98-h673-no
https://lh3.googleusercontent.com/A3Bmq ... 98-h673-no
Just showing how close the chain clearance.
https://lh3.googleusercontent.com/ABiYv ... 98-h673-no

That's it for now, a few more adjustments to the motor sprockets, cut & tighten chains, wire in speed controller & test sprocket speed. Then I start on the road wheels & tracks :(

Rob
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Re: Chieftain MK11 build

Post by Rob » Sun Nov 06, 2016 8:36 pm

Well it all looks good to me .

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AndyR
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Re: Chieftain MK11 build

Post by AndyR » Sun Nov 06, 2016 10:08 pm

Fantastic!!!

Well done, looks quite a tight fitment, i guess that explains the design of the final drive casing on the chieftain, it not only reduced the gearing but also moved the output shaft axis outside the hull envelope - make sense when you think about it.

Good effort.

I have been at a wedding this weekend so have achieved nothing unfortunately, either on CRARRV or on Robs grills......

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

Rob
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Re: Chieftain MK11 build

Post by Rob » Sun Nov 06, 2016 10:51 pm

Fear not Andy, any wedding that takes a full weekend has got to be good !

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AndyR
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Re: Chieftain MK11 build

Post by AndyR » Sun Nov 06, 2016 11:31 pm

Aye it was great (my brothers wedding), late night affair and Sunday morning start :)

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

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AndyR
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Re: Chieftain MK11 build

Post by AndyR » Sun Nov 06, 2016 11:34 pm

How thick is that motor mount by the way!!!

Looks like its 12mm thick Ally, that will be brutally strong!!

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

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possum
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Re: Chieftain MK11 build

Post by possum » Mon Nov 07, 2016 8:36 pm

Those bad boys are only 10mm thick ally :lol: Their going nowhere, Bob had them made for his fibreglass hull, a bit of a over kill in my ally hull... but they look & work great.

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AndyR
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Re: Chieftain MK11 build

Post by AndyR » Mon Nov 07, 2016 9:27 pm

Still, its very impressive.

I was looking at CR1 track tensioners, looks very very similar to Chieftains........ :)
Happy, Happy, Joy, Joy, Happy, Happy, Joy, Joy...........

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possum
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Re: Chieftain MK11 build

Post by possum » Sun Dec 04, 2016 7:50 pm

Haven't done much on the Chieftain lately,
life & work seem to get in the way. This afternoon managed to drop into the man cave & work on the build, after a lot of measuring, measuring again I took the jump into cutting the drive chains. After some tweaking & motor alinements, gear greasing I wired up the motors for a test expecting some of major problem. "It worked :o " I'm not going to know if I have the gear speed right until l finish the rest of the suspension, tracks & it moves but it works & the chain final drive clears the inner rear hull by about 4mm without me having to do any clearance cutting :D
Here my poor quality video clip

https://www.youtube.com/watch?v=SDptjQn-c4M

Rob
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Re: Chieftain MK11 build

Post by Rob » Mon Dec 05, 2016 5:29 pm

Result !

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possum
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Re: Chieftain MK11 build

Post by possum » Mon Jan 16, 2017 10:05 pm

Thanks to Howards hard work with a hammer on the forum, I can now post some update photos. :D

1st Happy New Year, 2017...year 3 on the Chieftain MK11 build. Still a long way to go, but still aiming to get a rolling hull this year. I've been working on the alignment of the idlers & rear sprockets...L/H side was ok, but the R/H side was somehow out hitting the side of the outer track guard. After a whole day measuring again & re-fitting it was re-aligned correctly. One side of Chieftain track has been roughly put together to help with the correct alignment of my next hurdle... building, mounting, of the road wheel bogies & upper track idlers.

Anyway some photos of the track & some road wheels placed roughly in position. Having the tracks in place make the tank look much bigger :roll:
https://lh3.googleusercontent.com/kM15F ... 50-h622-no
https://lh3.googleusercontent.com/ia2E6 ... 06-h622-no
https://lh3.googleusercontent.com/gOP6e ... 50-h253-no
https://lh3.googleusercontent.com/po6o_ ... 30-h622-no
https://lh3.googleusercontent.com/bcHTn ... 30-h622-no
https://lh3.googleusercontent.com/FBBs3 ... 30-h622-no
https://lh3.googleusercontent.com/WbIPB ... 30-h622-no

That's it for now cheers Gary

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