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Thread: Norton gearbox disassembly?
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5th January 2010, 03:07 AM #16Member
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Beware taper pins!!!!!!!
Be aware that the pins or tape4r pins! They must be driven out from the small end !!!!!!
Also they are not perfectly centered so you can be out 180 degrees when re-assembling, you should be able to tell just by looking if you have them aligned by checking both ways and seeing which is aligned.
Removing these pins the wrong way can crack your housings!!!
EDIT Please note the pins are unique to each piece so should go back in same hole!
alRemember if the ID exceeds the OD the hole will be on the outside!
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5th January 2010 03:07 AM # ADSGoogle Adsense Advertisement
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5th January 2010, 05:00 PM #17Product designer retired
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aljunk,
as mentioned earlier, the pin in my gearbox appears to be parallel according to my verniers. The pin I extracted is buggered, so I intend to replace it with a piece of bright ms wire, 3.18mm dia. or brass.
Can anyone see a problem with this?
Ken
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5th January 2010, 08:51 PM #18Senior Member
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6th January 2010, 02:28 AM #19Member
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hmmmm
When I went thu mine (made some new gears) it definitely has taper pins, but perhaps they did a few different things with the pins over the years......
Still I would check the holes both sides in case someone just managed to put in the wrong pin as it's quite common for people not in the trade to not know about taper pins.
alRemember if the ID exceeds the OD the hole will be on the outside!
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6th January 2010, 06:11 PM #20Senior Member
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The dreaded pin
Hi Ken, when I stripped my gearbox down the pin??? was noting but a piece of fine round?? steel
I being the handy person I am have a supply of nails and did find a 2" flathead nail cut to length to be a pretty good replacement
My gearbox pin was not visible and had me stumped but with the flat head nail it is easy to see as well as good to use to peen the other end of the nail over as mine was
Did anybody else find that pin had been peened over causing nothing but a nightmare ???
But then again it is not a everyday job stripping down a gearbox ,The other good bit using the flathead nail meant you did not hit the casting as mine had a few hammer marks as the old pin was a very solid fit
Well have fun painting as it is off to the Hospital AGAIN for a refit
Talk to you when I am back on deck again
all the best Derek
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7th January 2010, 11:36 PM #21Product designer retired
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OK, the hole thru the boss in the gearbox is a tapered hole, and wanting to do the right thing, the new pin I install should also be tapered. You have all told me, and I now agree.
Buggered if I can find a spec sheet that shows the dimensions of tapered pins. I reckon I'm gunna need a pin that's about 3.2mm at the big end, and a tad smaller at the other with a length of 32mm or 1.25".
Do you have a spec sheet showing imperial dimensions, and where in Melbourne are they available?
Ken
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7th January 2010, 11:54 PM #22Member
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#1 taper pin
If memory serves me right they are #1 taper pins. When I replaced mine I had to seat them in the tapered holes mark them (a bit long on the big end) then remove and trim the ends. they will all fit differently depending how deep they went with the tapered reamer. I bought a small kit with a selection of different sizes from a local industrial supplier so they should be readily available down there. Although u guys being down under the big end may be on the other end down there....lol
A while ago I bought some Hercus parts from a place called Newmac which is just up the road from Bitza's house, these guys prolly will have taper pins or can tell u where to get them in oz.
alRemember if the ID exceeds the OD the hole will be on the outside!
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8th January 2010, 10:51 AM #23Mechanical Butcher
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The books tell me that there are 2 types of taper pins - metric (1:50) and imperial (1:48).
For Hercus being Australian this could be tricky to identify, having changed over to metric.
That probably only affects the Model 260, earlier 9" I think would be all imperial.
Jordan
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8th January 2010, 01:35 PM #24Senior Member
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Check out MODEL ENGINEERING SUPPLIES
they are listed with there sizes in his catalog.
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