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Author Topic: New build start..GN Thunderbug.  (Read 12577 times)

Slack Alice

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New build start..GN Thunderbug.
« on: 23 May 2019, 09:06:15 pm »
I spoke to Chris And a few others at Stretton, and said I fancy building the GN Thunderbug. I’ve got the garage empty now and the first job will be to construct a building table, about 600 high. Then I can layout chassis etc...
I’ve acquired some 17mm kart spindles, and I think they will fit the design well.
I fancy a rack and pinion ( see other thread!!)
I’ve also picked up some bike engine bits in order to build a realistic looking v twin.
It will add weight but it is necessary.
What approx. Diameter is the final drive sprocket on the rear axle.

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RhysN

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Re: New build start..GN Thunderbug.
« Reply #1 on: 24 May 2019, 09:07:26 pm »
The answer to your question on approx diameter of the sprocket depends on; what ratio are you intending to use and what variety of the 4 "normal" chain versions.

StefanN

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Re: New build start..GN Thunderbug.
« Reply #2 on: 24 May 2019, 09:53:35 pm »
72 teeth on 0.5 inch chain is approx 11.5 inches in diameter
(72*0.5/3.14)

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #3 on: 25 May 2019, 09:03:52 am »
Thanks. I think I am about to buy an engine and TAV unit so that I can see what space is needed. Has anyone gone recommendations on a suitable combination/supplier?

RhysN

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Re: New build start..GN Thunderbug.
« Reply #4 on: 25 May 2019, 09:14:58 am »
Gemini Karts Rushden, good products VERY fair  pricing, and they support the hobby.

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #5 on: 26 May 2019, 05:26:54 pm »
Well...it’s a start!!

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #6 on: 31 May 2019, 01:53:53 pm »
Right guys..some 17” wheels arrived today. How do I get the bearings out to replace with 17mm ID bearings?

StefanN

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Re: New build start..GN Thunderbug.
« Reply #7 on: 31 May 2019, 03:38:54 pm »
I used a copper drift to knock mine out, working from the opposite side through the centre of the other bearing.  The tricky bit is catching the edge of the bearing with the crush tube in the way.  I then tapped the drift with a hammer moving around the edge of the bearing to keep is square to the seat.  Once the first side is out, the other side is much easier. Good luck

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #8 on: 31 May 2019, 06:32:50 pm »
Thanks Stephan. Yes, that inner tube gets in the way, there’s not much of an edge to get the drift on!

ChrisS

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Re: New build start..GN Thunderbug.
« Reply #9 on: 31 May 2019, 08:27:18 pm »
I ended up dismantling the bearing on one side by destroying the cage and then working all the balls round till they were all touching each other, then the centre can be broken free by a smart clout. This allowed me to remove the centre tube and drift out the opposite bearing but left the outer still in place on the first side and the only way I could get it out was by reassembling the balls and the centre and using a drift on the bearing centre.  Long winded I know!

RhysN

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Re: New build start..GN Thunderbug.
« Reply #10 on: 01 June 2019, 06:54:13 am »
TBH, I have never had too much trouble. As you are not going to re use the bearing who cares how much you damage it. I use a steel , sharp edged punch, first hit is to move the "crush tube across one way so you get a an edge on the inner of the bearing. Don't worry about getting to the outer race.
Once it has started moving, even a tiny bit, I just go from side to side giving the bearing a reasonably hard hit with a reasonable size hammer. Small hits with small hammer is more likely to cause damage.

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #11 on: 01 June 2019, 06:23:36 pm »
Thanks everybody...job done. Very sharp (tungsten) chisel did the trick. Just waiting for the new bearings now.

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #12 on: 01 June 2019, 06:32:15 pm »
Next issue...TAV modifications.   Engine and TAV have arrived and preliminary tinkering suggest a 10. o clock setting. This needs removal of some webs.
I know this has been done but are we OK with the process?

RhysN

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Re: New build start..GN Thunderbug.
« Reply #13 on: 01 June 2019, 07:22:16 pm »
Simple answer, yes.
I have used 6 o'clock for the last few.

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #14 on: 01 June 2019, 08:30:22 pm »
Ok I’ll check that out tomorrow. I see some karts use 4o clock. I’d rather not remove the webs.