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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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Circular saw blades
I have a DeWalt DC390 18v cordless circular saw. This takes 165mm
diameter blades on a 20mm arbour. I can't find any blade finer than 30 tooth to fit this saw. I have seen a Trend 48 tooth blade that has the same size arbour (20mm) but is 160mm diameter (5mm less). I have 2 questions. The first of course is if I fit the smaller Trend blade, will it be dangerous? Secondly, will it give me the fine cut that the blade is designed for? Whilst on this subject, am I right in thinking that the smaller the blade diameter, the fewer teeth are needed for finer cuts? For example, the trend described above has 48 teeth around its circumference. This gives 0.095 teeth per centimetre of circumference. On a 300 mm diameter blade, to get 0.095 teeth per cm you would need 90 teeth around the circumference. Which is a "fine" or even "extra fine" cut if you read the adverts. Is this sort of conversion the right thing to do? |
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Thanks for your reply Grunff. For interest though my maths for the
above is as follows. Circumference = PI * diameter so for the 160 diameter trend, we get 3.142 * 160mm = 502.72 mm for the circumference. Now there are 48 teeth around the circumference so 48/502.72 = 0.09548 teeth per centimetre. To get this number of teeth per centimetre on a 300 mm diameter blade, we would need a blade of 300mm * PI * 0.095 = 90 So a 90 tooth 300mm blade would have the same number of teeth every centimetre as a 48 tooth 160mm blade. Now my maths may be flawed, but could you expand a little on where I am going wrong. Thanks again. |
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Hi Dean
I have a DeWalt DC390 18v cordless circular saw. This takes 165mm diameter blades on a 20mm arbour. I can't find any blade finer than 30 tooth to fit this saw. I have seen a Trend 48 tooth blade that has the same size arbour (20mm) but is 160mm diameter (5mm less). There is a whole lot more to saw blades that just the number of teeth, pitch, angle, rake etc. I recently replaced the blade on my DeWalt radial arm saw. Same size, same bore, same number of teeth. Performance was entirely different. Splintering underneath, blade grabbing the stock etc. Had the old blade sharpened and it's now a different saw entirely. I'm not up on the whys & wherefores but do check it out first with someone who knows. Dave |
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David Lang wrote:
Hi Dean I have a DeWalt DC390 18v cordless circular saw. This takes 165mm diameter blades on a 20mm arbour. I can't find any blade finer than 30 tooth to fit this saw. I have seen a Trend 48 tooth blade that has the same size arbour (20mm) but is 160mm diameter (5mm less). There is a whole lot more to saw blades that just the number of teeth, pitch, angle, rake etc. I recently replaced the blade on my DeWalt radial arm saw. Same size, same bore, same number of teeth. Performance was entirely different. Splintering underneath, blade grabbing the stock etc. Had the old blade sharpened and it's now a different saw entirely. I'm not up on the whys & wherefores but do check it out first with someone who knows. Dave Codless circs are significantly different to mains circs. Theyre much lower power, tend to run at slower speed, and use a coarser cut blade, and possibly a thinner blade too, to make up for some of the lost ground. Whether theyre ground the same I've no idea, but would not assume so. I would not want to replace a codless blade with a mains one except as an experiment to see what happens. I would expect to get significantly lses cut per charge - theres good reason they use coarse blades. If you want something decent, use mains when poss. NT |
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In article , PC Paul
wrote: wrote: Codless circs are significantly different to mains circs. Something very fishy about that sentence. :-) -- AJL Electronics (G6FGO) Ltd : Satellite and TV aerial systems http://www.classicmicrocars.co.uk : http://www.ajlelectronics.co.uk |
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