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  1. #1
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    Default Non standard kerf

    A quick question to the brains trust. I have a job coming up where I need to rip 2mm and a 3mm channels 20mm deep in metres and metres of timber. I have a one saw blade with a 2.38mm kerf and a 3.175mm kerf blade

    To cut the 3mm I can use two passes with the 2.38mm but it’s fiddly.

    Has anyone ordered a custom kerf blade for a “table saw”( it’s a Makita circular saw 5900b mounted in a table).?

    I realise that a 2mm kerf means a thin blade
    Last edited by Lappa; 27th October 2017 at 11:45 AM. Reason: chsnged 12mm to 20mm

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  3. #2
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    Default

    Do it with a router fitted with a slot cutter.

    CARB-I-TOOL - Router Bit and Accessories Catalogue - NOVEMBER 2015

    Carbitool don't list a 3mm cutter but will make one to order.

  4. #3
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    Default

    For an extra 0.62mm What about mounting the blade slightly off square?
    You will need a pair of machined shims to place either side of the blade.

  5. #4
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    Default

    Or just experiment with two pieces of paper on opposite side of the blade to cause a slight wobble.

  6. #5
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    Quote Originally Posted by Bohdan View Post
    Do it with a router fitted with a slot cutter.

    CARB-I-TOOL - Router Bit and Accessories Catalogue - NOVEMBER 2015

    Carbitool don't list a 3mm cutter but will make one to order.
    Thanks. I have a 2mm slot cutter which I used in trial runs. Needed a minimum of 4 passes and 6 was better/cleaner, to get the 20mm depth. The saw method seemed the faster and easier of the two. I got a quote for another “one off” cutter from them some time ago and the cost was
    Last edited by Lappa; 27th October 2017 at 11:48 AM. Reason: changed 12mm to 20mm depth

  7. #6
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    I do it in one pass but I backcut with a power feed to get clean edges.

    For the 3mm cut they just need to grind a 3.2mm cutter down. Shouldn't be that much.
    Last edited by Bohdan; 27th October 2017 at 10:57 AM. Reason: Added text

  8. #7
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    The problem with the offset blade method (to me anyway) is that I need exact repeatability, as this may be an ongoing project.

  9. #8
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    both 3 mm and 2 mm should be doable with a reground ripping blade.
    Freud's LM72R010 blade might be the starting point for 3 mm, the saw plate is 0.087" (= 2.2 mm), and it's a FLAT grind so will leave a flat bottomed groove.
    Freud's LU87R010 blade might be a starting point for 2 mm, the saw plate is 0.071" (or 1.8 mm) and it's a FLAT grind, but I don't know if a 1.8 mm plate in a 2 mm slot is asking too much heat generation wise.

    BUT, is the Makita 5900 up to the job? If there is any float in the arbor or misalignment as you push the material across the blade the your grooves won't be 2 or 3 mm wide.


    Alternatively,
    I'm sure that Carb-i-tool could make you a 3 mm slot cutting bit (2 mm is a standard size).

    or they could make you a set of 2 mm and 3 mm straight router bits. But I don't like your chances when is comes to breaking bits if you are attempting to rout a slot 2 mm wide and 12 mm deep.
    regards from Alberta, Canada

    ian

  10. #9
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    I’ve already run 20 metres through the saw with the 2.38mm and 3.175mm blades and it was fine. Cut width along the cut was consistent. I explained my dilemma to the client and they say to do the first run with what I had available. They were happy with the finished articles but I’d like to narrow it down to their original spec. if possible.
    The saw is 2000W so it has more grunt than some table saws. It rips 45mm merbau no problems so softwood is not a problem. It’s set up as a full blown table saw with fence, mitre slots etc.

    I modified my first post as 12mm deep should have been 20mm deep - sorry

    Can’t buy 2mm or 3mm straight bits from Carbitool - closest is 1/8” and they only go 12.7mm deep and as you say, how long would they last anyway?

  11. #10
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    I’ve edited two posts. The 12mm depth should have been 20mm depth.

    I contacted Carbitool. $30 to grind a 3.2mm slot cutter to 3mm plus cost of cutter and approx. $50 (need to get a firm quote) to grind a 24T saw blade kerf.
    Last edited by Lappa; 27th October 2017 at 12:32 PM. Reason: Additional info

  12. #11
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    Quote Originally Posted by Lappa View Post
    I’ve already run 20 metres through the saw with the 2.38mm and 3.175mm blades and it was fine. Cut width along the cut was consistent. I explained my dilemma to the client and they say to do the first run with what I had available. They were happy with the finished articles but I’d like to narrow it down to their original spec. if possible.
    I suggest you sit down and discuss the "dilemma" with the client.

    in the discussion you may both find that 3/32" (2.38 mm) and 1/8" (3.175 mm) is a better match than the specified 2 and 3 mm. I'm thinking that if the slots are for appearance, do the fractions of mm really matter? and if it's to accept a sheet material, does the marginally wider slot make inserting the sheet material easier.
    regards from Alberta, Canada

    ian

  13. #12
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    As you can see from the text you have copied, it has already been discussed with the client and they are happy with the finished product. However, I would like to be able to deliver exactly what a client wants if they insist on it. Hence my post to see if it was achievable.
    Thanks to Bohdan for the reminder of Carbitool as they can deliver what I need if it is in fact needed in the future.
    Cheers.

  14. #13
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    I was thinking that the client's specification was potentially based on nothing more than 2 and 3 being whole numbers, in which case 3/32" (2.38 mm) and 1/8" (3.175 mm) might entirely satisfy the design brief.

    Alternatively, 2 and 3 might represent the ratio 2:3, in which case regrinding a thin kerf blade to 2.12 mm, when matched with a full kerf blade (3.175 mm) would achieve the desired result.

    Either way, your costs are minimised and you are not left with 2 odd sized cutting tools.
    regards from Alberta, Canada

    ian

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