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Thread: Can I do this with a dado blade
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3rd August 2013, 12:35 PM #1GOLD MEMBER
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Can I do this with a dado blade
This is a question about dado blade safety. I have an 8 inch dado blade set. Its one of those ones with 2 outer blades with 30 teeth, and 6 or so inner blades with just 5 teeth. I want to use it to cut rebates about 6mm wide by 3mm deep. The problem is it hasnt been machined very carefully and the inner blades cut slightly deeper then the outer ones, meaning the bottom of the rebate is not flat. The difference is only about 0.1 of a mm, but still not acceptable. I can change things so that the uneven depths are not a problem by using one of the inner blades outside the outer blades - in other words i would mount the two outer blades together against the arbour flange, then one of the inner blades, then the flange and nut. So my question is are there any safety issues involved in doing this ?
Of course I'm aware there may be quality of cut issues involved in doing this - I'll deal with those in due course, at this stage I'm just trying not to commit some sort of safety faux pas.
Cheers
ArronApologies for unnoticed autocomplete errors.
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3rd August 2013, 02:00 PM #2
For a rebate as small as you are wnting it may be better to use a router. Either in a table situation or a veneer trimmer. Ithink the router in the table version would be fast and accurate
Just do it!
Kind regards Rod
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3rd August 2013, 04:29 PM #3GOLD MEMBER
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Normally, i would use a router, but in this case I have some strong reasons for using the t/s. Its just a matter of whether there is a safety angle I've overlooked.
Cheers
ArronApologies for unnoticed autocomplete errors.
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3rd August 2013, 04:57 PM #4Deceased
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The outside blades cut the timber and the inside blades chip out the cutout bits of wood. Using a chipper blade on the outside is like trying to cut timber with a 5 toothed blade.
I'm not sure if it can cut like that but it's not safe IMO.
Peter.
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4th August 2013, 02:38 PM #5
The rebate still won't be flat, just deeper at the side instead of the middle. How is that "not a problem?"
Cheers,
JoeOf course truth is stranger than fiction.
Fiction has to make sense. - Mark Twain
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4th August 2013, 03:29 PM #6Deceased
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The thing that's been puzzling me is the difference, being about 0.1 of a mm. How can you discern such minute difference, about the thickness of a small bit of paper, as I'm sure my eyes could not detect that.
Nevertheless if this is such a problem I would take the whole set and samples of cuts made to a reputable saw sharpening service who no doubt could fix this by sharpening. I know mine, being Barry Bros in Croydon, could do it but others may be able to help you with a Sydney based firm.
Peter.
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4th August 2013, 04:33 PM #7
A quick swipe with a rebate plane will clean up the cut and even out the bottom. There are some other soloutions that would work also.
Do the rebate with the standard blade and do 2 cuts. No dado blade required.
Use a router.
And lastly a rebate plane.
Regards
John
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4th August 2013, 06:56 PM #8GOLD MEMBER
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Apologies for unnoticed autocomplete errors.
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4th August 2013, 07:14 PM #9GOLD MEMBER
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it probably exceeds my limited powers of expression to explain this properly, but here goes. What I'm cutting is a rebate.ultimately a piece of flat timber, very much wider then the rebate, is glued flush with the bottom of the rebate. If the deeper section is on the inside of the rebate then there is zero gap visible. Nice. If the deeper bit is on the outside of the rebate then the gap is visible. Sure its only paper thin, but its a gap that doesnt need to be there, so why have it. Sorry I cant do a diagram, but I only have a no-camera tablet and my frustration with trying to do a simple message is at critical point.
Now thats an idea, but do they really work to that degree of accuracy?Apologies for unnoticed autocomplete errors.
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4th August 2013, 07:30 PM #10GOLD MEMBER
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Apologies for unnoticed autocomplete errors.
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4th August 2013, 08:38 PM #11Deceased
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Gone are the days of hand sharpening with all those inaccuracies.
Where I get mine sharpened they have a big computer controlled sharpening machine which grinds/sharpen each tooth at each of the three sides and then moves on to the next tooth etc. That means that each tooth is the same size and sharpened to the correct angle and the blade is balanced.
So I would be very surprised if they could not set the machine to sharpen the outside blades and the chippers to the same diameter.
Peter.
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