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Master Series arm sticking...


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#1 Jason Torbitt

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Posted 30 March 2006 - 10:19 AM

Hi all,

We had an interesting experience today which I thought may be worthwhile sharing. I've had a service of my arm down as 'one of those things that is on the list of things to spend money on', but an issue arrived today that was interesting...

I operate with the usual Master front mounted vest. I went for a practice spin with Rick Lewis, who was using his Klassen back mounted vest. For me in my vest, I have no problems with the arm, full range of movement for booming, set the correct tension and away we go - it's what I'm used to, so no problems. But with the Klassen, the two sections of the arm are naturally closer / tighter together, obviously due to the positioning of the socket block on the carbon arm of the vest being different to that of the front mount.

For whatever reason, this illustrated the problem that my arm was suffering from a common-ish problem with the MS arms, sticking at the bottom and top of the range of its travel; looks to be caused by the slow ageing / wearing of the rubber bumper stops inside the arm casing. The section does make contact with the bumper, but not enough to prevent it sticking in position, and therefore leading to a jerk movement when an attempt is made to boom the arm up or down. I should add that wearing my usual vest, I can quite happily take the arm to both ends of its travel, and the arm respond fine, no sticking or jarring is apparent, which made the experience even more difficult to comprehend.

I hope this makes sense to anyone reading in - it was an issue I wasn't previously aware of in my arm, until it was used with the back mount vest. So now it's time for a repair and service before I make the investment in the back mount!

I always check the gear ritually for safety before I leave home, but its definatly worthwhile checking the arm more vigourously more often.

Interesting...
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#2 Alec Jarnagin SOC

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Posted 30 March 2006 - 02:50 PM

Jason,

Silly question, but did you try to tune the arm a little differently for the back-mounted vest? When I've used the Master arm with the Klassen vest, I have a vague memory of backing it off a turn or two compared to those using it with the front mounted vest.
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#3 Jason Torbitt

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Posted 31 March 2006 - 01:42 AM

Hi Alec

Yes, good question but yeah we adjusted the arm, tried the optimum level of tension, tried it with dialling some out, and tried with dialling more in. Very strange behaviour
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#4 thomas-english

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Posted 01 April 2006 - 06:45 AM

An element of "sticking" or locking at the ends of the boom range on the master arm was perfectly normal I thought. It can sort of jam/get comfortable at the ends. With the klassen the arm is doubled back on itself much more so your point of leverage is much closer compounding the problem, if I push the sled/arm out a bit it becomes much easier to leave the restaurant at the end of the travel. Something I do probably without thinking now and as a result it never "sticks". On the front mounted vest this is less of an issue because your leverage is higher.

N.B. I have probably got all my physics completely wrong as well as my spelling and sticking is definately the wrong word to describe it.... sorry saturday hung over.
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#5 Jason Torbitt

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Posted 01 April 2006 - 11:20 AM

With the klassen the arm is doubled back on itself much more so your point of leverage is much closer compounding the problem


Yeah, you got it; it was an interesting find, makes life more difficult to operate with the Klassen, but if you have found your way round it, then that's good to hear

sorry saturday hung over.


That makes 2 of us...one of those 'never again' mornings
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#6 Andrew 'AJ' Johnson

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Posted 13 April 2006 - 09:57 AM

one word.... PRO

-AJ
Andrew J
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