# Mortiser - 8mm bit

**URL:** <https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578>\
**Category:** Discussion\
**Created:** [8 September 2023 11:19 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578 "2023-09-08T11:19:00Z")\
**Posts on this page:** 20\
**Page:** 1

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**Author:** ![afshind](https://discourse.southlondonmakerspace.org/user_avatar/discourse.southlondonmakerspace.org/afshind/32/981_2.png) [@afshind](https://discourse.southlondonmakerspace.org/u/afshind)\
**Post date:** [8 September 2023 11:19 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578/1 "2023-09-08T11:19:01Z")

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Hi [@woodtechs](https://discourse.southlondonmakerspace.org/groups/woodtechs) I have 14 wooden door handles to make for home. If I buy a compatible 8mm mortiser bit for the door spindles, could I ask a tech to oversee its install? I have used and been inducted on it, back when it was in arch one. The new bit will be gifted to the space.

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**Author:** ![mbg](https://discourse.southlondonmakerspace.org/letter_avatar/mbg/32/5_5575768a8748004e209b776fc1b2916d.png) [@mbg](https://discourse.southlondonmakerspace.org/u/mbg)\
**Post date:** [8 September 2023 13:37 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578/2 "2023-09-08T13:37:50Z")

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Yes. I’m planning on refreshing myself on the tool install process tonight actually. When we’re you planning on doing this?

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**Author:** ![asander1](https://discourse.southlondonmakerspace.org/user_avatar/discourse.southlondonmakerspace.org/asander1/32/14251_2.png) [@asander1](https://discourse.southlondonmakerspace.org/u/asander1)\
**Post date:** [8 September 2023 13:43 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578/3 "2023-09-08T13:43:45Z")

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We wrote up some instructions on the Tool Page - and there is a PDF of the official instructions there also… I remember it being a bit fiddly to get right…

[https://discourse.southlondonmakerspace.org/t/mortiser-multico-k2/2027](https://discourse.southlondonmakerspace.org/t/mortiser-multico-k2/2027)

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**Author:** ![afshind](https://discourse.southlondonmakerspace.org/user_avatar/discourse.southlondonmakerspace.org/afshind/32/981_2.png) [@afshind](https://discourse.southlondonmakerspace.org/u/afshind)\
**Post date:** [8 September 2023 15:29 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578/4 "2023-09-08T15:29:17Z")

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Hi Max, I’m actually popping in 5pm today, should be free 5.30-45pm till 6.15pm. Haven’t ordered the but yet, but happy to do tonight after advice.

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**Author:** ![mbg](https://discourse.southlondonmakerspace.org/letter_avatar/mbg/32/5_5575768a8748004e209b776fc1b2916d.png) [@mbg](https://discourse.southlondonmakerspace.org/u/mbg)\
**Post date:** [8 September 2023 15:43 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578/5 "2023-09-08T15:43:42Z")

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Don’t think I’ll make it until 7 I’m afraid

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**Author:** ![afshind](https://discourse.southlondonmakerspace.org/user_avatar/discourse.southlondonmakerspace.org/afshind/32/981_2.png) [@afshind](https://discourse.southlondonmakerspace.org/u/afshind)\
**Post date:** [8 September 2023 20:47 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578/6 "2023-09-08T20:47:53Z")

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No problem. Shall we keep in touch on here? I’ll look for suppliers online and let you know what I find

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**Author:** ![afshind](https://discourse.southlondonmakerspace.org/user_avatar/discourse.southlondonmakerspace.org/afshind/32/981_2.png) [@afshind](https://discourse.southlondonmakerspace.org/u/afshind)\
**Post date:** [11 September 2023 09:44 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578/7 "2023-09-11T09:44:28Z")

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Would you know the shank size for the mortiser bits? I can narrow down the searxh…there’s a variety online but most seem for hand drill chucks.

[https://www.google.com/search?q=8mm+mortiser+drill+bit&oq=8mm+mortiser+drill&aqs=chrome.1.69i57j33i160l2.7060j0j7&client=ms-android-google&sourceid=chrome-mobile&ie=UTF-8](https://www.google.com/search?q=8mm+mortiser+drill+bit&oq=8mm+mortiser+drill&aqs=chrome.1.69i57j33i160l2.7060j0j7&client=ms-android-google&sourceid=chrome-mobile&ie=UTF-8)

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**Author:** ![mbg](https://discourse.southlondonmakerspace.org/letter_avatar/mbg/32/5_5575768a8748004e209b776fc1b2916d.png) [@mbg](https://discourse.southlondonmakerspace.org/u/mbg)\
**Post date:** [11 September 2023 10:03 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578/8 "2023-09-11T10:03:28Z")

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I’m planning on getting to the space in the early afternoon, I’ll check then

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**Author:** ![mbg](https://discourse.southlondonmakerspace.org/letter_avatar/mbg/32/5_5575768a8748004e209b776fc1b2916d.png) [@mbg](https://discourse.southlondonmakerspace.org/u/mbg)\
**Post date:** [11 September 2023 12:54 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578/9 "2023-09-11T12:54:04Z")

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This part is 20.6mm wide on all of ours, which is probably some fraction of an inch.

 ![IMG_5962](https://slms-discourse.s3.dualstack.eu-west-2.amazonaws.com/original/3X/7/6/76c85d2bdcfd26b631d3438809c1e6f96893c48a.jpeg)

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**Author:** ![mbg](https://discourse.southlondonmakerspace.org/letter_avatar/mbg/32/5_5575768a8748004e209b776fc1b2916d.png) [@mbg](https://discourse.southlondonmakerspace.org/u/mbg)\
**Post date:** [11 September 2023 12:55 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578/10 "2023-09-11T12:55:25Z")

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And here’s the collet that goes around the drill bit part

 ![image](https://slms-discourse.s3.dualstack.eu-west-2.amazonaws.com/original/3X/2/b/2b9741fca48a2b8504e73567b1a1d5d7630b0ee0.jpeg)

For reference:

 ![image](https://slms-discourse.s3.dualstack.eu-west-2.amazonaws.com/original/3X/2/f/2f26b919b117ec51dced8528071e077542a2e00c.jpeg)

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<div class="post-metadata">

**Author:** ![afshind](https://discourse.southlondonmakerspace.org/user_avatar/discourse.southlondonmakerspace.org/afshind/32/981_2.png) [@afshind](https://discourse.southlondonmakerspace.org/u/afshind)\
**Post date:** [11 September 2023 13:28 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578/11 "2023-09-11T13:28:01Z")

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Thanks Max. So I should look for bit with a shaft with imperial equivalent of 20.59 or 15.8?

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**Author:** ![asander1](https://discourse.southlondonmakerspace.org/user_avatar/discourse.southlondonmakerspace.org/asander1/32/14251_2.png) [@asander1](https://discourse.southlondonmakerspace.org/u/asander1)\
**Post date:** [11 September 2023 15:04 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578/12 "2023-09-11T15:04:23Z")

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From the manual:

 ![image](https://slms-discourse.s3.dualstack.eu-west-2.amazonaws.com/original/3X/1/c/1cfaa7e5c875844e3b0e624431232fcfa8197fc4.jpeg)

Sounds like originally there are 4 bushes to suit 4 different shank diameters on this machine, do we have them all? I am not sure, but sounds like we at least have these 2 based on what Max found:

13/16 in (20.6mm)  
5/8 in (15.875mm)

Hope that helps!

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<div class="post-metadata">

**Author:** ![asander1](https://discourse.southlondonmakerspace.org/user_avatar/discourse.southlondonmakerspace.org/asander1/32/14251_2.png) [@asander1](https://discourse.southlondonmakerspace.org/u/asander1)\
**Post date:** [11 September 2023 15:12 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578/13 "2023-09-11T15:12:28Z")

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So you probably want something like this:

> **[Japanese Pattern Mortice Chisels & Bits](https://www.axminstertools.com/harima-japanese-pattern-mortice-chisel-bit-8mm-510296?queryID=bf10f5759d949c01a7c53b407437c74b)**
>
> The design of the Japanese pattern could well reflect the use of softer timbers used in traditional Japanese furniture making, the auger having a deep, high ratio flute, quickly removing the longer slivers softwoods create. The auger bit on this...

 ![image](https://slms-discourse.s3.dualstack.eu-west-2.amazonaws.com/original/3X/4/e/4e32af513063d987bf12684f33738dcfe0c6c150.jpeg)

Though they have cheap adapters to go from 13/16 to 3/4 shank:

Which may open up your options? Not sure…

> **[Axminster Workshop Mortice Chisel & Bit Adaptor](https://www.axminstertools.com/axminster-mortice-chisel-bit-adaptor-400043)**
>
> This is a 13/16"to 3/4" chisel shank adaptor that sleeves down the bore of the morticer headstock to take 3/4" shank mortice chisels.

 ![image](https://slms-discourse.s3.dualstack.eu-west-2.amazonaws.com/original/3X/3/9/39316c547f8ac59c2e8310267b7b9e273fbc9fc2.jpeg)

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**Author:** ![mbg](https://discourse.southlondonmakerspace.org/letter_avatar/mbg/32/5_5575768a8748004e209b776fc1b2916d.png) [@mbg](https://discourse.southlondonmakerspace.org/u/mbg)\
**Post date:** [11 September 2023 15:55 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578/14 "2023-09-11T15:55:01Z")

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Just to be clear - the first image is the diameter of the chisel itself (20.6mm), and the second image is the diameter of the outside of the shank (15.8), which slides over the drill bit piece, we have a few of those to accept different diameter drill bits. I believe the first one is the one that matters, I’d assume thats the “chisel mount size” - 13/16" (wow what a fraction) is about 20.6mm

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**Author:** ![asander1](https://discourse.southlondonmakerspace.org/user_avatar/discourse.southlondonmakerspace.org/asander1/32/14251_2.png) [@asander1](https://discourse.southlondonmakerspace.org/u/asander1)\
**Post date:** [11 September 2023 15:58 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578/15 "2023-09-11T15:58:29Z")

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Makes sense, 13/16 seems to be a common shank size and then you can sleeve/adapt down from there…

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**Author:** ![afshind](https://discourse.southlondonmakerspace.org/user_avatar/discourse.southlondonmakerspace.org/afshind/32/981_2.png) [@afshind](https://discourse.southlondonmakerspace.org/u/afshind)\
**Post date:** [21 September 2023 09:33 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578/16 "2023-09-21T09:33:12Z")

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Do we have (or need?) an adaptor/sleeve to for this 3/4 inch to fit the 13/16 inch ?

[https://www.diy.com/departments/charnwood-mct08-trade-quality-8mm-mortice-chisel-bit-3-4-shank/5060486047741\_BQ.prd](https://www.diy.com/departments/charnwood-mct08-trade-quality-8mm-mortice-chisel-bit-3-4-shank/5060486047741_BQ.prd)

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**Author:** ![Ryanf](https://discourse.southlondonmakerspace.org/user_avatar/discourse.southlondonmakerspace.org/ryanf/32/11993_2.png) [@Ryanf](https://discourse.southlondonmakerspace.org/u/Ryanf)\
**Post date:** [21 September 2023 10:21 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578/17 "2023-09-21T10:21:16Z")

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I was down the other day and didn’t see any adaptor with the bits and pieces we have. All the chisels we currently have don’t require an adaptor, but moving forward, perhaps it’s a handy thing to have.

We’ll purchase it as woodtechs, it’ll allow us the flexibility to get differing chisels. Just let me know if you go ahead and order the chisel and I’ll make an order for the adaptor.

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<div class="post-metadata">

**Author:** ![afshind](https://discourse.southlondonmakerspace.org/user_avatar/discourse.southlondonmakerspace.org/afshind/32/981_2.png) [@afshind](https://discourse.southlondonmakerspace.org/u/afshind)\
**Post date:** [22 September 2023 12:20 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578/18 "2023-09-22T12:20:43Z")

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Order planced!

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**Author:** ![joeatkin2](https://discourse.southlondonmakerspace.org/user_avatar/discourse.southlondonmakerspace.org/joeatkin2/32/15352_2.png) [@joeatkin2](https://discourse.southlondonmakerspace.org/u/joeatkin2)\
**Post date:** [22 September 2023 13:29 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578/19 "2023-09-22T13:29:46Z")

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I thought you American it’s an imperial machine this is a good opportunity to express your americanness

🙂

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**Author:** ![afshind](https://discourse.southlondonmakerspace.org/user_avatar/discourse.southlondonmakerspace.org/afshind/32/981_2.png) [@afshind](https://discourse.southlondonmakerspace.org/u/afshind)\
**Post date:** [25 September 2023 09:30 UTC](https://discourse.southlondonmakerspace.org/t/mortiser-8mm-bit/29578/20 "2023-09-25T09:30:11Z")

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