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  1. #1
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    Question Help tracking down a router bit...

    G'day all, I am new here. I found this forum as I am having trouble finding a certain size router bit I would like.

    I am also relatively new to using routers, so I may well be in for a disappointing answer of 'it doesn't exist'.

    I am after a flush trim bit preferably with a top bearing.
    My router takes 1/4" and 3/8" shanks.
    I would like the cutting face to be 42mm in length or 1 11/16.
    I do not mind what diameter it is, however thicker would be preferred.

    Any help would be greatly appreciated, thank you.
    Josh

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  3. #2
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    Jan 2014
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    Default

    I have seen straight cut bits from China and Hong Kong with a 1/4" shank longer than that, but not one with a bearing. 25.4 mm or 1" seems to be the longest on the common brands. I'd be worried re deflection in long bits with 1/4" shanks.

  4. #3
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    Default

    Yeah, I figure thats why I cannot track one down.
    Perhaps I can find 2 1" bits, one with a top bearing and the other with a bottom bearing to make a pass on each side of the material.

  5. #4
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    Hi Josh,
    Im surprised that your router takes 1/4" and 3/8" shanks. The norm is 1/4" and 1/2" and there are adaptors/collets available that take the 1/2" down to 8mm.
    If you can confirm the 1/2" (vs 3/8") issue then you will find a suitable bit online in the catalogs of Carbatec, Carbitool, Timbecon etc. These bits will have a 1/2 shank and probably won't be called "flush trim" but pattern bits or similar.

    fletty
    a rock is an obsolete tool ......... until you don’t have a hammer!

  6. #5
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    Yeah it is a little odd, its a Makita RP0900X1
    https://www.makita.com.au/products/p...-plunge-router

    It comes with a collet for 1/4" - which I only found out by asking the sales guy why on earth they were selling a 3/8" collet router.

  7. #6
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    Default

    It's raining outside and I've lost possession and control of the TV remote so I have time to 'browse'. SO FAR, the only bits I can find that match your needs have 1/2" shanks? There are a couple of alternatives. If you live near me, you could borrow a router and 1/2" shank solid carbide fluted bit from me that match your job perfectly. If not, a more local fellow forumite might also step up? A third option is to ask Carbitool to make a bit for you to suit the 3/8" shank but I fear that design calculations for that cutting length probably preclude a shank less than 1/2"?

    fletty
    a rock is an obsolete tool ......... until you don’t have a hammer!

  8. #7
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    Fletty

    That is such a generous offer, especially since I'm brand new here. Thank you very much. Unfortunately I live in Brisbane - I'll update my details later.

    I'll contact Carbitool tomorrow for a chat, I didn't know that was an option!

    I have found 2 bits to get the job done with a pass from either side, one 1" cutter and one 19mm inverted bearing. Its $60 odd worth of bits and twice the work, but if that what it takes then so be it! LOL

    Thanks again mate, really happy I signed up here.

  9. #8
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    Josh,

    What about this one from the "Big Green Shed"....

    https://www.bunnings.com.au/diablo-1...m-bit_p6370467

    Looks a little shorter than you want but its a start

  10. #9
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    Sydney Upper North Shore
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    Default

    I have a Makita (years old) also that takes 1/4" or 3/8" bits.

  11. #10
    Join Date
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    Default

    Even if you could use a template guide bush to guide the router I don't think you will find a 3/8" shank straight or spiral bit that will provide the cutting length you're looking for. With 1/2" shanks you'd have no problem. A lot of manufacturers don't make any bits with 3/8" shanks, Freud and Whiteside are two exceptions that I know of. Try some of the other American manufacturers, they are the most likely to make something that will do the job for you.

    Although you can buy a 1/4" shank bit to do the job it's disturbing that none of the quality brands make such a bit. Methinks because the possibility of them performing satisfactorily is almost non-existent. 1 pcs 1/4" Shank 2" Blade Extra Long Flush Trim Router Bit- 3/8"W x 2"H | eBay

  12. #11
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    Quote Originally Posted by Josh_ View Post
    Yeah it is a little odd, its a Makita RP0900X1
    https://www.makita.com.au/products/p...-plunge-router

    It comes with a collet for 1/4" - which I only found out by asking the sales guy why on earth they were selling a 3/8" collet router.
    a quick read of the linked manual says that a 8mm collet is available to your router.

    most of the router bits CMT make are available with 1/4" or 8mm shanks.
    The longest 8mm shank bit (with a top bearing) I can see has a cutting length of 35 mm, a diameter of 16mm, and uses replaceable cutters -- order number 656.160.11
    The longest conventional 8mm shank bit (with a top bearing) I can see has a diameter of 16mm and a cutting length of 31.7 mm -- order number 912.160.11B.
    Almost certainly you would have to order both bits from Europe.

    Of course, a shorter 1/4" bit will work, if you take two or three passes. CMT part number 812.127.11B is just one option.
    regards from Alberta, Canada

    ian

  13. #12
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    Default

    a second hand router would be cheaper than these exotic bits?

  14. #13
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    You could be correct, then again I'd view an 8 mm collect as an investment which would allow the router to be used with the 8mm bits recommended for use with a Leigh Jig.
    regards from Alberta, Canada

    ian

  15. #14
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    Default

    Thanks for all the help guys, I didn't get anymore notifications of replies hence my late response.
    I will look into all this info, thanks so much.

    I had no idea about 8mm shanks, so that's definitely something to consider.

    I thought of a second hand router to take 1/2" bits - I could get one for around $150 and a bit for $30-40...So at $180 - $200 I'd prefer to find something under $100 that will do what I want with my current brand new router.
    Its kind of for one job too and then will be there if I ever need something similar, if I get into anymore than this 1 situation in the future I will invest in a larger router for sure.

    Thanks again guys, I'll let you know how I get on!

  16. #15
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    Default

    If you get a solid carbide 3/8" spiral bit you can use the shank of the bit as your bearing surface as carbide spirals are always the same diameter for the full length.

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