Building new cam chain guide

If it's broken or just needs tweaked

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Bbarnellb
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Joined: Mon Jun 03, 2013 10:28 pm

Building new cam chain guide

Postby Bbarnellb » Tue Oct 22, 2013 10:56 pm

I had my cam chain guide snap in three and no one sold them, but luckily I am an Integrated Engineer and am currently building them using stainless steel as the skeleton and an epoxy base as the contact service. After testing I will let all of you know how it goes.

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Folsoml
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Re: Building new cam chain guide

Postby Folsoml » Wed Oct 23, 2013 12:09 am

Can't wait to hear the results!
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Volker_P
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Re: Building new cam chain guide

Postby Volker_P » Wed Oct 23, 2013 2:02 am

Epoxy? I doubt this will withstand steel rubbing for long. Not sure about long term oil resistiveness either. I'd rather prefer something like polyethylene.
If to be done as "one part" drill and insert (with cement) metal pins or maybe bolt/rivet a glider/guide to a stainless steel backbone rail.
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Bbarnellb
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Re: Building new cam chain guide

Postby Bbarnellb » Wed Oct 23, 2013 9:51 pm

It's an epoxy type it cost me $250 for a quart and is special formulated by master bond, they are an epoxy company designing bond for oil and chemical companies this has a tensile strength higher than any O.E.M. Guide I know of plus can withstand 1200 degrees F and is a smooth finish for the guide part. So I believe this application will work just dandy.

Bbarnellb
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Re: Building new cam chain guide

Postby Bbarnellb » Tue Nov 05, 2013 11:20 pm

First test done. I have built three to the exact same specs. The first test was temperature break done of part. This part max. Temperature in degrees F. Is 800 degrees for 15 minutes before composite break down, then takes 10 minutes before chain contacts stainless steel surface. So pretty impressed so far. In the next day or so I will get the results for the tensile strength and also structure composer to see any weak areas to improve.

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Volker_P
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Re: Building new cam chain guide

Postby Volker_P » Wed Nov 06, 2013 3:29 am

Good idea to do external tests before installation.
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forum links to common technical issues

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Bongskit
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Re: Building new cam chain guide

Postby Bongskit » Fri Nov 08, 2013 10:04 pm

I will get in line. Sign me up.

Bbarnellb
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Re: Building new cam chain guide

Postby Bbarnellb » Sat Nov 09, 2013 2:49 pm

Test #2 results: strength testing, bending in the middle and ends, and breaks or fractures in surface. This test went well and close to the calculations we predicted for this part. Bent in the middle at 438 lbs applied directly, broke welds. Fractured surface in middle at 280lbs. ends bent at 318 lbs and fractured at 212lbs applied. So to say the least stronger than O.E.M. And can handle the heat as shown in test #1 results, next test actually in motor running. I will let you know how it goes and I will try to post pics of it soon so you can see what the changes are.

usbear
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Re: Building new cam chain guide

Postby usbear » Sun Nov 10, 2013 8:24 am

Thank You for the update. Good Progress.

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Folsoml
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Re: Building new cam chain guide

Postby Folsoml » Sun Nov 10, 2013 4:37 pm

This is good stuff! Thanks!
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Volker_P
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Re: Building new cam chain guide

Postby Volker_P » Tue Nov 12, 2013 2:49 am

Bbarnellb wrote: This test went well and close to the calculations we predicted for this part.

Calculations? You take this really serious.
I'm impressed.
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forum links to common technical issues

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Bbarnellb
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Joined: Mon Jun 03, 2013 10:28 pm

Re: Building new cam chain guide

Postby Bbarnellb » Tue Nov 12, 2013 8:18 pm

Yes I did, I built the product first into a CAD program and applied the necessary materials. With that built, we ran a stress analysis and also heat range inputting the various factors. This gave me the calculations for both scenarios and we got very close results.

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Volker_P
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Re: Building new cam chain guide

Postby Volker_P » Wed Nov 13, 2013 3:26 am

New times.
Maybe in a few years we will also use 3D printers to make our obsolete parts ourselves.
Cosky's great (free) online manual: http://cosky0.tripod.com

forum links to common technical issues

If you really like this site and you would not like to see it vanish soon, have a look there: Urgent: Future of HondaCB650.com Forum

Bbarnellb
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Joined: Mon Jun 03, 2013 10:28 pm

Re: Building new cam chain guide

Postby Bbarnellb » Thu Nov 14, 2013 9:17 pm

Pictures of the new Cam Chain Guide. In #2 you will see some imperfections in the guide surface, and it looks to be a crack is not its just the way this epoxy base cured. This is the Second guide I built the first was uglier but it was the test project as well and is no longer serviceable as it went through stress analysis earlier in Test #1 & #2. But this is what they look like and on the pins we are applying a small amount of another poly base as a shock and friction absorbent to lessen the chatter movement and solidify the part in the motor.
Attachments
IMAG0163.jpg
Guide #3
IMAG0163.jpg (30.46 KiB) Viewed 8303 times
IMAG0162.jpg
Guide #2
IMAG0162.jpg (33.44 KiB) Viewed 8303 times
IMAG0161.jpg
Guide #1
IMAG0161.jpg (34.14 KiB) Viewed 8303 times


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