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Old 03-02-2011, 11:50 AM   #1
JRP OP
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R80 G/S skidplate

I only had the small plate for my bike and wanted a PD version, they are all but impossible to find so I deiced to make one.
First and foremost I want to thank all my friends at Micatech for their help in getting me the raw materials. (Visit their website and buy some of their great panniers!!)
I got a template from The Raven and found a few more on here. I took them all mixed and matched and drew up one in AutoCAD.

I used 6061 T6 aluminum..very hard to bend so I annealed it first. Here is the cutout flat plate.




Next were the dimples for the mounting screws, I didn't want them to protrude under the plate and didn't care for the socket and hammer method to make them, I'm not that good to get them all even. I made up a punch and die for that purpose.



I drilled pilot holes then just used a hydraulic press to put in the dimples.





Finished product, it's mounted solid for now but I'm going to look into using rubber grommets and shoulder bolts.

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Old 03-02-2011, 01:23 PM   #2
One Less Harley
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You can still get the bolts and grommets from BMW if you wish.
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Old 03-02-2011, 02:55 PM   #3
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Awesome. W/O the rubber grommets my guess is that it's going to resonate at some RPM range. More than likely a range like 3500-4500 that you use all the time.

I might know someone who has 4 grommets and 4 old screws in a box of old parts in Montana.

Tom
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Old 03-02-2011, 03:38 PM   #4
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Serious question here...would the battery holder box rubber isolators work?

Two benefits if it did.
-Isolation from vibes
-not needing to thread rethread into the butter material oil pan and risking stripping.
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Old 03-02-2011, 03:44 PM   #5
One Less Harley
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Here's what the stock ones look like.

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Old 03-02-2011, 03:45 PM   #6
Martian
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Nice job! I'm going to have to bookmark this thread; I might want to use that punch and die setup sometime. That's kickass!

My take on the stock setup is that it absorbs a certain amount of shock. I'm going to get a set with my next order.
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Martian screwed with this post 03-02-2011 at 03:51 PM
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Old 03-02-2011, 03:48 PM   #7
Udo
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Very nice

Been thinking same thoughts on my '84. Need a more robust skid plate. Looks like a straightforward fabrication. Thanks.
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Old 03-02-2011, 03:59 PM   #8
icebox
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Nice work

Nice work, especially the punch and die with the locating pin.

So you have the file as a dxf. ? just curious why you didn't put the holes in the cad file?
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Old 03-02-2011, 04:56 PM   #9
meijer's trails
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battery mounts too weak

Sweet skid plate and dimples!!

I've been ripping through every type of 6mm rubber mount, which is bigger than the battery mount.

I think a hidden bolt with bellvelle spring washers might be the solution. Maybe use shoulder bolts through a shock mount tunnel like stock.
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Old 03-02-2011, 06:17 PM   #10
fishkens
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What? No build thread for the punch and die? They look like a very nice piece of work.

Nice work and thanks for posting.
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Old 03-02-2011, 11:35 PM   #11
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Quote:
Originally Posted by Infracaninophile View Post
Awesome. W/O the rubber grommets my guess is that it's going to resonate at some RPM range. More than likely a range like 3500-4500 that you use all the time.

I might know someone who has 4 grommets and 4 old screws in a box of old parts in Montana.

Tom
I think the dimple would have to be larger in diameter to use the stock bolts and bushings.
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Old 03-02-2011, 11:37 PM   #12
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Quote:
Originally Posted by The Raven View Post
Serious question here...would the battery holder box rubber isolators work?

Two benefits if it did.
-Isolation from vibes
-not needing to thread rethread into the butter material oil pan and risking stripping.

I looked at vibration isolators and could still go that way. I think the battrery box ones might be a bit on the small side.
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Old 03-02-2011, 11:43 PM   #13
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Quote:
Originally Posted by icebox View Post
Nice work, especially the punch and die with the locating pin.

So you have the file as a dxf. ? just curious why you didn't put the holes in the cad file?

The holes are in the cad file, I marked them roughly on the flat blank before annealing. As a final check I used my small skid plate as a pattern to redrill the holes to size. The pilot holes are smaller than 6 mm as they stretch a bit when the dimples are put in.
I have it as .dwg, but can save it .dxf
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Old 03-03-2011, 02:27 AM   #14
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hope this helps...clearly not. Even i can't read it.

I will search out a larger copy..
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Old 03-03-2011, 02:33 AM   #15
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Try try again

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