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18th December 2012, 02:12 PM #1Novice
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Can I use a 180mm saw blade in a table saw designed for 210mm?
I'm trying to get a TCG negative hook blade to cut some acrylic that's 6mm thick. However, I can't find many blades that fit this profile. The blade size is either 180 or 215+.
I've read a bit about rpms to be worried but not enough to know what I'm talking about.
The table saw I have is a makita 2708, 210mm blade, runs at 4500rpm.
Can anyone recommend a place where I can get the 210mm version in sydney, that would be good too.
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18th December 2012 02:12 PM # ADSGoogle Adsense Advertisement
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18th December 2012, 03:48 PM #2
Mate a 180mm blade only means that you will be able to make a cut 15mm less in height than the 210mm. If 180mm is all you can find and you are only cutting reasonably thin stuff then go right on ahead. The world won't collapse around you.
Have a Merry ChristmasJust do it!
Kind regards Rod
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18th December 2012, 06:39 PM #3
I use smaller blades quite often with no probs.
Especially if I'm just making relatively unimportant cuts, I save my good blades for the important cuts.
Just as often you have to wind the blade down.
In the case of a smaller blade - not so m,uch.
Good luckHave a good one
Keith
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18th December 2012, 08:19 PM #4SENIOR MEMBER
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According to Vermont you need to keep your blade speed between 10 000 SFPM (surface feet per minute) and 18 000 SFPM. 10 000 SFPM is 42.33 m/s, and with a 180mm blade spinning at 4500 RPM, you have a tip speed of 42.410 m/s, which is only just within the specs. So yes, you can probably get away with it, but it's not optimal.
http://www.vermontamerican.com/NR/rd...deRPMChart.PDF
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19th December 2012, 06:44 PM #5GOLD MEMBER
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Interesting that American Vermont is now owned by Bosch. Anyway, that table is intended for cutting wood, with plastic you problem is going to be that the friction from the blade is going to melt the plastic, which will then gum up the blade (and other bits too if it gets the chance).
So a 180mm (or even smaller) blade in a table saw is not a problem - remember they make 6 inch (150mm) dado sets for the same saws. The smaller blade WILL give you a lower speed at the rim than a larger saw, but with plastics that is A GOOD THING, unless you like chiselling hardened plastic swarf off everything (DAMHIK).
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19th December 2012, 08:15 PM #6SENIOR MEMBER
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20th December 2012, 02:26 PM #7Novice
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I'm aware of the melting problem but only having read about it in theory, I can't say for sure what's going to happen.
From reading around the place, (this seems to be a very comprehensive plastic cutting site: Learn How to Cut, Drill and Finish the Edges of Plexiglass (acrylic)), I have gotten a TCG TCT negative hook blade (210mm) which will hopefully, if pushed at the right speed, cut it without melting or chipping. I also read that negative hook reduces heat transfer to the rip material, is this in line with people's experiences?
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