BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


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

RT

avatar
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.


__________________________________________________
Suzuki V Strom 650DL 2011. Gasp, chain driven.
    

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

indian036

avatar
Life time member
Life time member
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    Re: High tensile bolt cutting on Mon Feb 05, 2018 2:59 am

Stan

avatar
Life time member
Life time member
Good to see you coming back into the BMW family RT.


__________________________________________________

1983 K100basic vin 0003960 colour red
1987 K100RT vin 0094685 colour, orange peel, sorry, pearl
    

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

RT

avatar
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.


__________________________________________________
Suzuki V Strom 650DL 2011. Gasp, chain driven.
    

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

Gaz

avatar
Life time member
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
95 K1100LT 0232224; 90 K75 6427509; 87 R80G/S PD 6292136
    

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

RicK G

avatar
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.


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

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    Re: High tensile bolt cutting on Tue Feb 06, 2018 1:07 am

Waz

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


__________________________________________________
1987 K100 RS
1997 R1100R
1996 R1100GS
    

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

RT

avatar
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.


__________________________________________________
Suzuki V Strom 650DL 2011. Gasp, chain driven.
    

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

mike d


Life time member
Life time member
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 on Tue Feb 06, 2018 5:30 pm

RT

avatar
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.


__________________________________________________
Suzuki V Strom 650DL 2011. Gasp, chain driven.
    

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

indian036

avatar
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
    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum