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25th Dec 2021, 02:49 PM #1Most Valued Member
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Linishall belt tracking adjustment
Picked up this linishall BG8 model - knowing it wasn’t tracking properly but the price reflected that.
From reading the manual I know the adjusting bolt is machined out of true and the general idea is to rotate the adjuster until the belt tracks properly.
I’m suspecting that either the adjuster or the arm it runs in are bent, as this is the closest I can get it to parallel, and hence can’t get enough adjustment to fix the belt running off to the right.
Here’s another photo showing the arm angle.
I would expect it to be parallel to the face of the drive wheel (straightedge is against wheel) but it’s miles out.
Anyone got the same machine to check?
Steve
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25th Dec 2021, 03:02 PM #2Senior Member
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I'll be interested to see what comes of this thread.
I have the 100mm belt version. I've never managed to get it to run consistently straight for any more than a few seconds before it starts randomly wandering.
My theory is that the design is a bit of a dud, exacerbated by the 100mm belt and it's just not rigid enough.
Hopefully someone will pipe up with some trick how to set these up.
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25th Dec 2021, 03:46 PM #3Most Valued Member
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I have the Multitool version, and it does the same thing!! Also interested in the replies
KrynTo grow old is mandatory, growing up is optional.
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25th Dec 2021, 03:51 PM #4Senior Member
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Actually mine is the Multitool too.
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25th Dec 2021, 05:07 PM #5Most Valued Member
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Linishall belt tracking adjustment
After a bit more poking and wiggling I decided to remove the end arm with the contact wheel and see if it was actually bent.
After removing the contact wheel and axle/adjuster, I clamped the arm in the vice and set the square steel part (that slides in the main arm) level, then tried to check if the cast arm bit was also level. Not easy to measure, but seemed to be about 2deg out.
Cast piece is just attached onto the end of the square steel part by a single countersunk screw from inside the guard part. Removed that, separated the 2 pieces and then set the cast part up in the mill vice.
A quick sweep with an indicator showed the mounting face definitely wasn't square with the adjuster arm, so I gave it a quick skim to square it up. Needed almost 1mm taken off at the horizontal face to get it flat.
Reassembled, and there's now enough range in the adjuster to make it track perfectly, and enough spare to make the belt move to the left which it definitely wouldn't do previously.
From playing with various linishers and belt sanders over the years the usual culprits for unstable tracking are either play somewhere arms/adjusters/bearings or the adjuster itself moving while the machine is in use.
This was the first time I've come across one that I just couldn't get enough adjustment in the one direction. Still not sure if it was an original manufacturing issue and its always been out of square, or possibly it copped a knock at some point, or perhaps even just bent slightly over time under normal use due to continual load from the tensioning spring.
Steve
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25th Dec 2021, 06:19 PM #6
First class diagnostic and repair.
It sure sounds like you have helped quite a few linisher owners.
Thank you
Grahame
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25th Dec 2021, 06:23 PM #7Golden Member
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That alignment issue seems to be typical of the breed.
We acquired a 3 phase Linishall 100 mm belt grinder at work around 2006 and having ordered that brand on the basis of a reputation for quality I do recall some disappointment with the alignment and also vibration, probably related to poor dynamic balance, and a sheet metal stand resonating in sympathy with it.
Seems the manufacturer was getting slack: the motor nameplate shows the power as 1100hp. Oops!
BillLast edited by WCD; 25th Dec 2021 at 06:24 PM. Reason: spelling
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25th Dec 2021, 08:54 PM #8Most Valued Member
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25th Dec 2021, 10:28 PM #9China
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Linishall are not what they used to be
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26th Dec 2021, 08:04 AM #10Diamond Member
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I bought a multitool a few years ago and initially I couldn't get the belts to track properly.
I did some googleing and it turns out the the front wheel didn't have a crown on it, so I crowned it slightly with a file and haven't had any issues since.
Sent from my SM-G935F using Tapatalk
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26th Dec 2021, 12:36 PM #11Most Valued Member
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26th Dec 2021, 01:46 PM #12Diamond Member
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It's only done very slightly, the wheel is ribbed anyway so that may prevent a flat grind in the first place.
I can use the platen if I want a flat grind.
Sent from my SM-G935F using Tapatalk
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26th Dec 2021, 02:19 PM #13Most Valued Member
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I realise that the Multitool slightly rotates the arm, but mine still allows the edge of the belt to run against the drive pulley, and there's no more adjustment left. The way I see it is that the arm is also not quite square to the mounting plate.
Steve, nice work on the rectification process.
KrynTo grow old is mandatory, growing up is optional.
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26th Dec 2021, 03:47 PM #14Most Valued Member
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26th Dec 2021, 04:14 PM #15China
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The contact wheel should be flat, otherwise it will fight with the rear crowned wheel, the adjustment is most likely jammed from accumulation of dust etc.
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