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1Back to top Go down   High tensile bolt cutting Empty High tensile bolt cutting on Mon Feb 05, 2018 2:22 am

RT

RT
Life time member
Life time member
Hi Metallurgists amongst us.
My recent purchase of an ex police R1200 has a quiet superficial looking mounting system for town panniers, that is they are only connected by two bolts into the frame at the top, nothing onto the lower frame. I am thinking of using a couple of stainless steel high tensile bolts in there but it looks like I may need to cut about 5 mil or so off the ends.
Question: If I cut them with an angle grinder, will the heat affect the strength of the remaining bolt? Any clues please.

Thanks and Cheers, RT.


__________________________________________________
2011 R1200RT
    

2Back to top Go down   High tensile bolt cutting Empty Re: High tensile bolt cutting on Mon Feb 05, 2018 2:47 am

indian036

indian036
Life time member
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Use one of the very thin cutting wheels (<2mm thick) to make a faster cut, and generate less heat because you are removing less metal. I don't use the ~3-4mm ones any more.

Not an expert (I can ask my materials engineer son), but I suspect the load would be nowhere near the capacity of the bolt, even if it was degraded a bit by heat.

What diameter is the bolt in question?

Bill


__________________________________________________
1985 K100RT  VIN 0028991  My original Very Happy   (Historic rego)
1985 K100RT  VIN 0029036  BOB the Blue Old Bike  (Historic rego)
1990 K100LT  VIN 0190452  Work in progress
1984 K100RT  VIN 0023022  Work needing lots of progress

1986 K100RT  VIN 0090542  Work needing lots and lots of progress
1993 K1100LT  VIN 0183046  Work in progress
1993 K75S  VIN 0213045  Newest toy, slightly non-original
    

3Back to top Go down   High tensile bolt cutting Empty Re: High tensile bolt cutting on Mon Feb 05, 2018 2:59 am

Stan

Stan
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Good to see you coming back into the BMW family RT.


__________________________________________________
1983 K100 basic vin 0003960 colour red  GONE
1987 K100RT vin 0094685 colour, orange peel, sorry, pearl..GONE
F800R black
    

4Back to top Go down   High tensile bolt cutting Empty High tensile bolt cutting on Mon Feb 05, 2018 5:16 pm

RT

RT
Life time member
Life time member
Thanks men. Bill it's 6 mil. I may yet be able to buy the correct length, haven't looked in any specialist sights. Local hardware dudes have a minimal selection.
Your next question will be how long is it? Only just trial fitted the boxes yesterday in readiness for a trip to Goulburn (run away), and didn't measure it more than with a thumb and little finger.

Thanks Stan, I still can't believe I was allowed to do this. Now I need cooler weather, stupid full fairing.


__________________________________________________
2011 R1200RT
    

5Back to top Go down   High tensile bolt cutting Empty Re: High tensile bolt cutting on Mon Feb 05, 2018 9:28 pm

Gaz

Gaz
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Life time member
RT, I cut stainless bolts to the length I require all the time and have never had any issues. Agree with Bill re using one of the very thin cutting disks in my grinder.

When cutting off the bolt wrap a wet rag around the bolt as close as possible to the cut position which will minimise any heat travelling up the bolt.

Without having looked up the shear strength tables I also think a 6mm bolt will have way more capacity than the load you can put in a pannier and you have two bolts holding it on.

Cheers


__________________________________________________
Gaz
1990 K75 6427509; 1987 R80G/S PD 6292136; 2010 G650GS ZW13381; 95 K1100LT 0232224
    

6Back to top Go down   High tensile bolt cutting Empty Re: High tensile bolt cutting on Mon Feb 05, 2018 9:39 pm

RicK G

RicK G
VIP
VIP
Bob cut it with a 1mm cutting disc, clean up the end so a nut screws on and use it. The bit that gets heat affected will fall on the floor. TIP it will be hot, don't pick it up too soon.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

7Back to top Go down   High tensile bolt cutting Empty Re: High tensile bolt cutting on Tue Feb 06, 2018 1:07 am

Waz

Waz
Life time member
Life time member
Hello Bob
I have a thin cutting wheel in my grinder if you want to use it


__________________________________________________
1988 K100 RS
1999 K1200 RS
1987 K100RS DJP sidecar
    

8Back to top Go down   High tensile bolt cutting Empty High tensile bolt cutting on Tue Feb 06, 2018 3:16 am

RT

RT
Life time member
Life time member
Well I may have to carry 24 cans of beer in each at the Snowy run. 
Tks, I'll head off and buy some proper bolts and see what happens. Tks Waz may take you up on that. Then I need to weld the pannier frames back up. Over to Sir Bill for that.


__________________________________________________
2011 R1200RT
    

9Back to top Go down   High tensile bolt cutting Empty Re: High tensile bolt cutting on Tue Feb 06, 2018 3:31 am

mike d

avatar
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Another tip is to run a nut down the bolt. Cut the bolt to the length required. Dress the cut edge, and then run the nut off. As you do so it will clean the thread up.

Mike

    

10Back to top Go down   High tensile bolt cutting Empty High tensile bolt cutting on Tue Feb 06, 2018 5:30 pm

RT

RT
Life time member
Life time member
Thanks Mike. I have visions of my police style panniers dropping off on the freeway with my clean undies and socks disappearing under a truck. All info greatly appreciated.
Bob.


__________________________________________________
2011 R1200RT
    

11Back to top Go down   High tensile bolt cutting Empty Re: High tensile bolt cutting on Tue Feb 06, 2018 6:29 pm

indian036

indian036
Life time member
Life time member
@RT wrote:Well I may have to carry 24 cans of beer in each at the Snowy run. 
Tks, I'll head off and buy some proper bolts and see what happens. Tks Waz may take you up on that. Then I need to weld the pannier frames back up. Over to Sir Bill for that.
Happy to help.  Smile

Bill


__________________________________________________
1985 K100RT  VIN 0028991  My original Very Happy   (Historic rego)
1985 K100RT  VIN 0029036  BOB the Blue Old Bike  (Historic rego)
1990 K100LT  VIN 0190452  Work in progress
1984 K100RT  VIN 0023022  Work needing lots of progress

1986 K100RT  VIN 0090542  Work needing lots and lots of progress
1993 K1100LT  VIN 0183046  Work in progress
1993 K75S  VIN 0213045  Newest toy, slightly non-original
    

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