Chain joining..a bit of a " Peen" - MVAgusta.net
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post #1 of 18 (permalink) Old 05-24-2013, 08:42 AM Thread Starter
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Chain joining..a bit of a " Peen"

ok, I am joining the 525 drive chain using a standard soft link,

I have a decent tool to do this " Motion Pro"

The rivetting question is this how much do I peen the chain pin over ?

Is there a dimension increase at the peen I should be looking for ?

tia

joe
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post #2 of 18 (permalink) Old 05-24-2013, 08:46 AM
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Joe, doestn't the Motion Pro tool stop at the correct "squish"?

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post #3 of 18 (permalink) Old 05-24-2013, 10:27 AM Thread Starter
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Quote:
Originally Posted by silentservice703 View Post
Joe, doestn't the Motion Pro tool stop at the correct "squish"?
I don't know Chuck. I was under the impression that if you keep turning the screw the rivetting end goes further and creates a larger peen.

Where is a blacksmith when we need one !

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post #4 of 18 (permalink) Old 05-24-2013, 10:38 AM
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that tool is probably similar to the DID tool I've been using for years. On that tool you can't compress it too much, the way the pin tool is machined it's not possible. On my tool you basically tighten it til it won't go anymore, then your done, the key is for the rivet tool to be centered when you do it. I've done a bunch of chains without issue.
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Originally Posted by gotojoe View Post
I don't know Chuck. I was under the impression that if you keep turning the screw the rivetting end goes further and creates a larger peen.

Where is a blacksmith when we need one !

joe

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post #5 of 18 (permalink) Old 05-24-2013, 11:23 AM
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It should be an anvil peen, Joe. It should also have a positive stp...mine is a DID though.

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post #6 of 18 (permalink) Old 05-24-2013, 01:12 PM Thread Starter
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Hi Chuck,

I did some investigations and found a Motion Pro Youtube and then I referred back to the instructions with the Motion Pro Tool.

There are two main operations to fit the soft link. First is the pressing together of the soft link side plates.

To do this correctly you should vernier gauge the chain's other links across the side plates and note the span dimension. I did a few to get a good average. Then when you press the plates together using the motion pro tool you should go so far and then stop and measure...If more squeeze is required then you add a little more with the tool. This negates getting a stiff link ; )

The second phase is the peening of the two soft link rivets.

The motion pro tool does have an anvil but there is a range of peening available before you hit the stop.

The amount of peen required ( according to Motion Pro instructions ) is seldom more than 0.028 inch ..or 28 thou to the ancients... This is a tiny amount of peen ...

The important thing here is again to use the other rivets on the chain as a reference and measure them with the vernier. This will give you the amount to peen. There is also I am sure a specified unpeened to peened diameter increase for the chain link size...I used the other rivets as my reference as the Motion Pro man said so !
As a guide it is seldom required to do more than one full turn of the key to acheive the correct peen diameter. So you know if from the initial bottoming out of the tool to do about half a turn and then check and then a little bit more and check again.

It is a common misconception to think it necessary to mushroom out the rivet head significantly..Nope..less is more.
I am sure a tech who has been doing this all his life will smile at my measured methodology..but without a real feel for it I reason best to be careful as I don't want the fooker flying off anytime. People would say ....

Look what he D I D !!!

joe

ps I DID it my way

Last edited by gotojoe; 05-24-2013 at 01:19 PM.
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post #7 of 18 (permalink) Old 05-24-2013, 03:04 PM
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So, to recount, if I understand:

The problem with your Peen is

That it must be measured against others for length and girth.
Those measurements must be visually checked against examples whose peen is of nice mushroom heads.


When those comparisons are made, then you must manipulate yours until your Peen is the same as the others, because length and girth and mushroom are the true measures of how good your Peen is.....

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post #8 of 18 (permalink) Old 05-24-2013, 04:27 PM Thread Starter
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Quote:
Originally Posted by silentservice703 View Post
So, to recount, if I understand:

The problem with your Peen is

That it must be measured against others for length and girth.
Those measurements must be visually checked against examples whose peen is of nice mushroom heads.


When those comparisons are made, then you must manipulate yours until your Peen is the same as the others, because length and girth and mushroom are the true measures of how good your Peen is.....
Next project ride height ...Preload good....

You Americans ! Good one Chuck.. : )

Last edited by gotojoe; 05-24-2013 at 04:30 PM.
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post #9 of 18 (permalink) Old 05-24-2013, 05:09 PM
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Joe,I havn't bought a chain for awhile,but the last endless chain I installed had a piece of wire shapped like a M,so that wire goes underneath the outer plate while you are riveting the pins.The piece of wire allows for the correct spacing during the riveting process,when finished you pull the piece of wire out and the link cannot be too tight.


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post #10 of 18 (permalink) Old 05-24-2013, 05:21 PM Thread Starter
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Thanks Mitchy ..That's useful..I have already done it and the plates are ok not to tight...It is a bit of a black art but once I started measuring things I felt confident that I wasn't butchering it..

joe
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