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Author Topic: Gear for gear box  (Read 3250 times)

A71

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Gear for gear box
« on: July 11, 2012, 09:17:16 PM »

Hi
My Dad has a gear box in his multi hull ( storm 2 ) with a K and B 21 on an mod one gear box believed to be a John stidwell early type box the problem is he has striped the gear
He doesn't want to have to get a new box as its only a boat he uses on Sunday at the club

On the gear it say SHM LTD 32 DP 45T

We have looked around and can't find we're to get a new one can any body point us in the right direction ??

Here are a few pictures taken on my iPad so a bit naff



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Andyn

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Re: Gear for gear box
« Reply #1 on: July 11, 2012, 09:21:24 PM »

Yep that's a Stidwell box alright... Diameter of the gear, amount and pitch of teeth and dia of inner hole?
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A71

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Re: Gear for gear box
« Reply #2 on: July 11, 2012, 09:36:51 PM »

Only thing I can tell you Andy is it 32 dp 45 t

Aprox diam 1/38 and in new money 34mm job to tell as there s a few gears missing  {-)

1.4 shaft hole but has been bushed down to that so has 5/16 with brass insert

Width of the gear is 1/4 overall with is 1/2 inch
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Andyn

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Re: Gear for gear box
« Reply #3 on: July 11, 2012, 09:53:29 PM »

Blimey that's an odd one... I'll have a look :-))
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A71

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Re: Gear for gear box
« Reply #4 on: July 11, 2012, 10:02:07 PM »

Thanks fella  :-)) we have asked Greg as well but we still can't find one
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Mad_Mike

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Re: Gear for gear box
« Reply #5 on: July 11, 2012, 10:31:48 PM »

I think this might to the job. the first list is steel gears the second list is hard steel gears and the last is delrin gears.

http://www.hpcgears.com/newpdf/spurgears_32dp.pdf

you then go to the order form. This company can also customise the gears on request, its based in derbyshire.

http://www.hpcgears.com/
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A71

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Re: Gear for gear box
« Reply #6 on: July 11, 2012, 10:43:33 PM »

Think we have a winner :-) thanks MadMike at least I can get him back on the water :-)
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scoop

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Re: Gear for gear box
« Reply #7 on: July 12, 2012, 09:28:42 AM »

Thanks fella  :-)) we have asked Greg as well but we still can't find one
Hi John, try asking Ian S. I gave him a box full of gearboxes and delrin gears a while back, he may be able to help you out  :-))

Cheers
Scoop
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A71

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Re: Gear for gear box
« Reply #8 on: July 12, 2012, 11:02:23 PM »

Thanks scoop I will when I see him   :-))
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Subculture

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Re: Gear for gear box
« Reply #9 on: July 13, 2012, 10:44:07 AM »

HPC make very nice gears and other reduction components, and can supply pretty much anything you want, but be warned the price soon adds up once you factor in custom bore sizing, shipping etc.  If you do go for that option it might be worth looking at a metal or tufnol gear, which will last a long time, the extra cost over a machine cut plastic gear is quite small.

Andyn

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Re: Gear for gear box
« Reply #10 on: July 13, 2012, 06:52:08 PM »

it might be worth looking at a metal or tufnol gear, which will last a long time, the extra cost over a machine cut plastic gear is quite small.

Delrin is the way to go, the main gear is sacrificial... :-))
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ids987

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Re: Gear for gear box
« Reply #11 on: July 14, 2012, 07:54:56 AM »

Hi John, try asking Ian S. I gave him a box full of gearboxes and delrin gears a while back, he may be able to help you out  :-))

Cheers
Scoop

Thanks scoop I will when I see him   :-))

Speak his name and he doth appear. Are you or your Dad about in the morning ?
I've got a few "Stiddy" gears (thanks again Scoop ;)). Most are 50T, but I've got a used 45T.

Ian
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ids987

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Re: Gear for gear box
« Reply #12 on: July 14, 2012, 09:05:54 AM »

Delrin is the way to go, the main gear is sacrificial... :-))

I think it's mostly that way cos delrin (or nylon, and some other plastics) on metal is/are what's known as "self-lubricating" - no external lubrication required. If both gears are metal, it needs constant lubrication. There were some Russian gearboxes with oil baths built into the chassis - so that the lower gear runs in an oil bath.
In a race - where you often can't hear your own engine, a sacrificial gear is often closely followed by sacrificial rod, sacrificial piston, and sacrificial liner.
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Subculture

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Re: Gear for gear box
« Reply #13 on: July 14, 2012, 11:21:50 AM »

If you want it self lubricating a tufnol gear will still offer that, but being a composite, and using a thermoset plastic will be a lot stronger than delrin (or any other thermoplastic).

A71

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Re: Gear for gear box
« Reply #14 on: July 14, 2012, 02:21:00 PM »

Ids we should be at the "pond " in the morning weather permitting  :}
Not sure I like the sound of sacrificial engine components lol
Thanks every one for your input  %%
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Andyn

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Re: Gear for gear box
« Reply #15 on: July 14, 2012, 02:49:37 PM »

Aren't all your engines sacrificial Ian? ;)

Will be at the lake tomorrow, if it's not sloshing it down I may even bring a boat....
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A66

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Re: Gear for gear box
« Reply #16 on: July 14, 2012, 03:37:19 PM »

Hi guys should i bring said box of bits in morning !? along with the new beastie ! if i can carry it to the car.
Steve
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A71

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Re: Gear for gear box
« Reply #17 on: July 14, 2012, 04:50:31 PM »

WoW he knows how to use the computer aghhhhh lol
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scoop

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Re: Gear for gear box
« Reply #18 on: July 14, 2012, 06:52:26 PM »

WoW he knows how to use the computer aghhhhh lol
He always has done John, you just didn't know  {-) {-) {-)
Scoop
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ids987

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Re: Gear for gear box
« Reply #19 on: July 14, 2012, 09:13:30 PM »

Hi guys should i bring said box of bits in morning !? along with the new beastie ! if i can carry it to the car.
Steve

Hi Steve, I'll bring the box of gearbox bits down anyway. The 45 tooth should be almost a dead cert. I've got more of the 50 toothers, but you'd either have to raise the engine or need a smaller driver gear - which I may have amongst the same stuff. If you bring your box of bits down we could size up, but probably best start off like for like, or you'll need to be going up in prop sizes too.

Ian
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A66

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Re: Gear for gear box
« Reply #20 on: July 14, 2012, 10:20:28 PM »

Thanks Ian, Infact thanks to all for your help, bit of luck i might be able to get past greg now!
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