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20th February 2023, 09:13 PM #1
Help with my Makita 4" Belt Sander issue please!
Help with my Makita 4" Belt Sander issue please!
I don't use my old Makita 4" Belt Sander all that much these days but needed to us it last week.
It spat the sanding belt in about a minute, so I got a new one out of the box [old stash] and the exact same thing.
After 5 belts let go, all along the seam I gave up using it and put it away for another day.
My question is please ladies and gents;
Does the join in the sanding belts become fragile as with age or is the issue with the machine and or the operator?
Thank you in advanced, Cheers crowie
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20th February 2023 09:13 PM # ADSGoogle Adsense Advertisement
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20th February 2023, 09:19 PM #2
Crowie
afraid as you get older the joints become weaker
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20th February 2023, 09:19 PM #3
Did you put the belts on in reverse? ie: the arrows should indicate clockwise rotation when viewed from the RHS of the sander
The person who never made a mistake never made anything
Cheers
Ray
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20th February 2023, 09:25 PM #4
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20th February 2023, 09:32 PM #5GOLD MEMBER
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- Sutherland Shire, Sydney
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Peter, have a close look at the innards of the sander, there may be a build up of dust causing the problem. A good blow out with compressed air will help. If you don't have a compressor, take it down to the local servo and give it a blast. Standing up wind might be useful!
Alan...
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20th February 2023, 09:35 PM #6
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20th February 2023, 10:17 PM #7GOLD MEMBER
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- Townsville. Tropical Nth Qld.
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It will be the glue join. Up here in the tropics belts don't last very long before they fail, so I only buy new one's when I have a project coming up.
Rgds,
Crocy.
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21st February 2023, 03:41 PM #8
Peter
The glue joints dont stand the test of time especially this last couple of years high humidity. I would say the fact they all went at the joint is a belt problem. Tracking problem with the machine usually results in the side of the belt being chewed up. Someone else was asking not that long ago about resticking them but the general opinion was just get new belts.
Regards
John
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21st February 2023, 09:39 PM #9
I don't have much experience with belt sanders and timber but quite a lot with free belt machines as a metal polisher. The arrows on the belt material are to allow users to refit belts in alternate directions when swapping grits with belts, rather than indicating a required direction of rotation. As the belt is operating in one direction, the leading edge of the grains on the belt coating wear and loose some of their 'cut'. The belt can be installed with the arrow in the reverse direction for the next time the particular belt is used, giving a fresher 'cut' and increasing belt life. When both edges of the abrasive particles become partially worn, the belt is considered a 'soft' belt and used further along the finishing route.
The direction which the belt is facing when installed on the machine has no bearing on the tension applied across joint during operation, that is a function of the machine speed, torque and the load applied by the user pushing it onto the work. Drive and idler pulley/roller sizes and the backing of the belt also have involvement in the ability of the belt joints to withstand use, some backings and coatings simply lack the flexibility to manage tight radius bends at high speed, and impose significant stress on the joints when forced to do so, precipitating early joint failure. Beyond all of that, age and heat also affect most belt jointing systems to a degree, so belts that have been stored for some time will have significantly greater failure rates and shorter time before failure than fresh belts.I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.
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21st February 2023, 09:51 PM #10
The problem as has been mentioned, is that the glue joint is failing from lack of use. Discard them and buy new belts. In the past I have tried re-gluing after extensive joint cleaning, with pva, contact adhesive and even CA. All this had very limited success.
JimSometimes in the daily challenges that life gives us, we miss what is really important...
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22nd February 2023, 08:48 AM #11I now have 3 sheds
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- 185
Hi Crowie
Same thing happened to me. I inherited a dozen or so new unused belts from my father after he passed away. They had been sitting unused for more than 5 years after I acquired them, so may have been 10 years old. All of them promptly fell apart at the join as soon as the belt touched the timber surface. As they failed one after the other in quick succession I do remember thinking to myself ' b*gger me, they're all fark@ed'.
All was not lost though. I kept the belts and tear off small sections when needed for rough hand sanding. It's a lifetimes supply, they are really tough and take a fair while to wear out.
just my 2c worth
Twosheds
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22nd February 2023, 08:52 AM #12
Pete, I would give the fibre glass filament tape a go. I have used it a few times with mixed results. You have nothing to lose. I cleaned the joint and back of the belt with thinners then joined the belt with the tape and applied a block either side of the belt and left a "g" cramp on over night. As I say I got mixed results
Just do it!
Kind regards Rod
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