Author Topic: Oscillating multi tools - do blades really wear out so fast?  (Read 987 times)

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Offline Deke

  • Posts: 188
I bought a Dewalt oscillating multitool this past weekend, and used it to cut out about 6" of baseboard trim (vertically, from floor to top of the trim). I took my time, didn't push it/force it, but was kind of shocked the stock blade was pretty much toast after this one cut. Is that normal? Are there specific brands of blades that are of good quality (and worth the corresponding price). I do like the tool itself - no complaints there. I'm just a homeowner, so cost of blades won't kill me, but I figure some of you pros out there have found a way to keep the blades running and costs down.

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Offline ear3

  • Posts: 3292
Re: Oscillating multi tools - do blades really wear out so fast?
« Reply #1 on: October 10, 2017, 04:48 PM »
That sounds a bit too quick even for an off-brand blade to wear out.  Is it possible you were hitting the drywall/plaster behind the trim, which will normally dull a wood or multipurpose blade pretty quickly?

Also, blade wear is accelerated when you start burning/smoking the material, which will happen if you're not creating enough movement on the cut for the sawdust to escape.
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Offline tjbnwi

  • Posts: 5159
  • Cedar Tucky Indiana
Re: Oscillating multi tools - do blades really wear out so fast?
« Reply #2 on: October 10, 2017, 04:54 PM »
Slow the speed of the tool down.

Tom

Re: Oscillating multi tools - do blades really wear out so fast?
« Reply #3 on: October 10, 2017, 05:10 PM »
Slow speed down a bit and don't force the machine, let the blade work. Have a little glass of water nearby to cool the blade if you have a lot of cutting to do in one go. On the Fein Wood/Metal blades they used to have stickers saying Max 4 Speed setting or something like that. I have my Fein mostly at speed 4 and the blades last quite long. When they are dulling out I keep them for cut outs in plaster where they hold up for a very long time.

I did use another brand - Imperial??! - and they were really good on cutting down nails and such and lasted a very long time for "mixed materials" work.
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Offline Deke

  • Posts: 188
Re: Oscillating multi tools - do blades really wear out so fast?
« Reply #4 on: October 10, 2017, 05:32 PM »
Ah, okay I was almost certainly cutting too fast and there was plaster-lather behind it. I'll be smarter. Gee, there was this thing called a manual in the box...  [smile]

Offline tjbnwi

  • Posts: 5159
  • Cedar Tucky Indiana
Re: Oscillating multi tools - do blades really wear out so fast?
« Reply #5 on: October 10, 2017, 05:34 PM »
Helps to rock the tool a little also.

Tom

Offline w802h

  • Posts: 202
Re: Oscillating multi tools - do blades really wear out so fast?
« Reply #6 on: October 10, 2017, 05:48 PM »
When I cut plaster with a multitool, I use an abrasive blade designed for plaster or concrete.  Plaster wears blades hard!  I use a spent wood blade for sheetrock.  The substrate matters a lot.

Offline kevinculle

  • Posts: 140
Re: Oscillating multi tools - do blades really wear out so fast?
« Reply #7 on: October 10, 2017, 08:00 PM »
Bosch makes a multitool blade for woodcutting that is a carbide toothed section (not grit like a tile blade) that is brazed to a steel blade.  It costs a bit more but lasts much longer than the typical blades. The P/N is OSC134.

Offline antss

  • Posts: 1286
Re: Oscillating multi tools - do blades really wear out so fast?
« Reply #8 on: October 10, 2017, 08:38 PM »
How many teeth per inch does that stock blade have ?

I've found that small teeth and numerous TPI blades don't work all that well in dense woods , especially MDF baseboard.  Old oak flooring will wear out just about any blade you throw at it too.  I have better luck with Japanese saw type blades.

I concur that slowing the speed down helps in many cases.  I've also had good luck with Bosch's blades in terns of wear.

Offline DB10

  • Posts: 879
Re: Oscillating multi tools - do blades really wear out so fast?
« Reply #9 on: October 10, 2017, 10:32 PM »
Try using Bi-Metal Blades, they cost a bit more but if you hit a nail or screw it doesn't wreck the blade and they keep there edge a lot longer.

Offline Laminator

  • Posts: 297
Re: Oscillating multi tools - do blades really wear out so fast?
« Reply #10 on: October 11, 2017, 11:01 PM »
The bosch carbide blades are well worth the money. They will far outlast hss (bimetal) blades in wood and metal. They will even handle hardened steel screws if the need arises.

Online Naildrivingman

  • Posts: 289
Re: Oscillating multi tools - do blades really wear out so fast?
« Reply #11 on: October 12, 2017, 06:15 AM »
Try using Bi-Metal Blades, they cost a bit more but if you hit a nail or screw it doesn't wreck the blade and they keep there edge a lot longer.
I second the Bosch for general cutting of unknown internal composition.  For fast and clean cutting of wood I have used Imperial hardwood blades.  They are similar to Japanese teeth, but not as fragile.
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