Proxon KS230 table saw motor 'kaputt'.

I only use it for cutting pcb, very rarely for fiber glass, 1 minute into operation, almighty squeal and a minute whiff of slight smoke, blade still spinning then - dead as a dodo.

Soooo, I opened it up, took the motor out and stripped it down. I thought these things suppose to have oil or grease in - nuffing at all like that, dry as a bone. Armature looks OK so did the field coils no smell of varnish as I was expecting.

One of the tiny chokes in series with the brushes was open circuit, I was about to un solder it and one leg fell off so I removed the heat shrink sleaving to find the coil intact a load of soot in the area just above a RFI capacitor that had one leg missing.

I only bought it early January last year so the warranty has just about expired, so I made my feelings known at Proxon, and doubt it's worth paying some £72.50 for a new motor... and the flimsy 'Splitter Wedge' as Proxon calls it that always seem to jam no matter what blade is being used.

I reckon some arching at been going on to create the soot, but what do you reckon on seeing no lubricant.... not even in the bearings?  No over current or temperature sensor at all, 85Watt motor straight on to mains AC via a 1 pole switch.

Dave

Edited By Sparks on 13/08/2020 23:18:38

Based on my experience with a couple of Proxxon products I think they are overpriced and under engineered.

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I'm sure the likes of Makita or DeWalt could also sort them out too.

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Sorry to hear about your saw Dave.

I thought Proxxon warranty was for two years now but maybe it depends on where you purchased it.

I've had one of these little saws for many years. I use it to trim/cut small wood sections for my G3 modelling and it works well within its limits - giving a very fine cut. It does have a number of limitations, including a lack of height adjustment for the blade and a less than accurate mitre & fence but these can be overcome with some fiddling. I have larger saw tables that are better in many ways but none will cut so finely.

With regards 'grease' - it's not something I really want in the works of my wood saws. I clean mine out after every use and grease and fine wood dust are not a good combination in this respect. I do agree that Proxxon tools are somewhat expensive but the ones I have seem to work well enough when used within their limits.

Being a bit of a bodger at heart, where I need something more 'robust' for my small scale work, I like adapting larger (older) tools. For instance, I have several Coronet combination machines that were very popular back in the 50-60's. They are very well made (much better than todays stuff) but were a compromise for any serious (full scale) 'woodworker' - having relatively small saw tables for instance. However, with some simple accessories, they are very good modellers tools - where the smaller size of materials they handle comfortably isn't a limitation.

My Proxxons work OK for the light duties I use them for but for "heavier" work I think larger machines adapted for (the relatively) smaller work are often a better (and cheaper) option.

Regards,

IanT

I can agree with Barry Lever. the TBM220 still going OK, looks like they had the afterthought of missing a lamp out under the bottom where the drill fits... looks like a cut out for a lamp shade device, my guess is this would involve a little more expense.... ten minutes ON then give it a rest - that is sure a good indication of under engineering.

I Agree the prices seem high for what they are, a lump of plastic , a coil of wire... and NO lubricant in the motor!

Looking at the RFI chokes looks as if they doubled for a fuse, the wire, about 15 to 20 turns of.... about 40 SWG on a ferrite rod of some permeability - 36SWG I have is far thicker!

I couldn't resist firing my satisfaction of to Proxxon - this darn motor WAS MADE to fail in my view.

Dave

Edited By Sparks on 14/08/2020 09:51:14

Edited By Sparks on 14/08/2020 09:53:06

At the risk of breaching forum rules ... I offer this link : **LINK**

http://yaya-online.com/-e-n-/shpSR.php?A=1613&p1=520

Not as a recommendation, but simply as a source of useful dimensional information.

MichaelG.

I had an identical issue with their long neck grinder which was well out of warranty. A capacitor blew. To my surprise after contacting proxxon explaining the light use the machine had compared to the more robust rotary tool of theirs they replaced the unit for free.

Having had numerous proxxon tools I am of the opinion that they don't make them like they use to do.

Mine survives but has one serious design flaw, namely, that the tool is held solely by friction and however much tightened can work loose in use.

I recall pointing this out to a Fein rep and later noticed that they brought out a new version with positive location of the tool; later still they and others brought out an SDS version. My impression is that the tool is otherwise well made and I think Fein deserve credit for inventing the tool category.

Thanks to Micheal Gilligan I've bookmarked the link - just in case, whether I'll repair or not I ain't bothered to be honest... might even blow my mind and get a pcb guillotine - the flimsy splitter wedge saw to that, very poorly designed I'd say, they don't flap around on a proper table saw do they.

If Proxxon wants to replace it OK, I doubt I'll be handing £72 over for a thing like that..... Bearings - aren't they supposed to be greased since we are talking about two dissimilar metals and 85 Watts of heat traveling down the shaft, I bet all your Bosch, De Walt and other machinery will have grease in them?

Dave

?

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The small bearings I've had apart looked more like an anti-moisture film than grease or oil. Probably deliberate because dinky fast motors don't have the grunt needed to push through sticky grease, and oil flies about. Likely the bearings in an 85W 5000rpm saw rely more on minimised rolling resistance than conventional lubrication.

Are the bearings confirmed as root cause? From the symptoms I suggest the saw blade gripped, stalled the motor, and caused the 'fuse' to blow. Possibly blade blunted by cutting PCB? I've found printed circuit boards murder blades, and not just the fibre-glass type.

The motor is may still be OK if the damaged coil and capacitor fused. I'd replace them with a similarly thin bit of wire and try again.

Barrie gets a Special Mention in Dispatches for the most impractical forum fix offered this year: What really needs to happen is for Proxxon to be bought out by Bosch like Dremel, and then some people in Bosch would get the issues sorted out in short order. (Only teasing Barrie, but that's exactly what you typed. Not sure how Sparks will arrange the takeover!)

Dave

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”rolling resistance”

Just a question [because I don't know] ... Does the aforementioned motor have ball-bearings, or ‘Oilite style’ bushes ?

MichaelG.

That reminds me, I must check the bearings in my 50+ yearold home made saw bench !

Maybe they need to be greased, or maybe I should just leave them alone, since they are doing OK ?

These little Micky Mouse "tools" are not made for serious work, just for playing with.. Get yourself a real saw.

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My Proxxon IB/E is about 15 years old, well built and runs true, head and shoulders better than any rotary tool I have seen from Dremel.

This may be of interest : **LINK**

http://www.melzer.cc/?p=896

It’s five years old, and in German

... here’s a translation courtesy of DeepL

[quote]

The (inexpensive) circular table saw suddenly stopped working after intensive use. After unscrewing it, a (80W?) sewing machine motor could be detected. Replacement price of the motor approx. 50€. Does not make much sense with a new price of the circular saw of approx. 90€. Further the motor was screwed on. Nothing smokes, nothing burns, not even the "typical" smell of burnt electronics. After measuring the few components/winding it became clear that an interference suppression coil has become highly resistive. The imprint "7R8K" is not very helpful.7R8KI cut open the heat shrink tube. Wound up enamelled copper wire (as expected). Common values of interference suppression chokes are in the μH range. I close 7,8μH. Spare ordered (10μH) and soldered in.ks230_2The saw "does" again. :mrgreen:

This entry was posted on July 24, 2015 under General.

[/quote]

.

MichaelG.

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Edit: I probably shouldn’t link the video, because it provides reference to component sellers ... but I note that another German chap has provided  - Mehr Power für die Säge! - by installing a brushless DC motor.

Nice !

Edited By Michael Gilligan on 14/08/2020 23:02:46

I've got a Proxon table saw, even after plenty of abuse it's still going strong. As far as benefiting from being taken over by Bosch my Bosch strimmer is the biggest heap of junk I've ever bought. The telescopic handle is held together with duct tape, and every time I switch it off the inertia of the spool holding the string overcomes the lock, and if I don't remember to upend it and re-lock every time it then throws the spool across the garden. When I rang to complain I was asked if I wanted to book it in for a paid for (by me) repair. I won't repeat my reply.

Edited By duncan webster on 14/08/2020 22:53:08

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