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Mexco Core Cutter Arbor


Onoff

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42 minutes ago, Onoff said:

Anyone know what arbor will fit this Mexco core cutter. The thread is nom. M20 but finer than M20 coarse.

 

 

 

I'm hoping it's one of these but there's no "try before you buy" now at TS / SF with this Covid thing! Take a chance I suppose

 

https://www.toolstation.com/diamond-core-drill-sds-adaptor-pack/p79014?

Yup. It's the one that's compatible.

Edited by Nickfromwales
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14 minutes ago, Nickfromwales said:

Yup. It's the one that's compatible.

 

Ta. No.1 son has just surfaced so he can run me down to TS. First proper core cutter I've had this. Builders left it at a mates works along with a 125mm and another 65mm one. 

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Trying to knock up a really long extension bar for this core cutter.

 

IMG_20200818_125424324.thumb.jpg.0c5d98e05401cad414c9af8e53ae9b97.jpgin

 

Outside dia of thread measures nom. 20.5mm.

 

As for thread pitch, three threads cover nom. 5.5mm, 4 cover about 6.75mm. that's then about a 1.7 /. 1.8mm pitch. Can you get M20x1.75?

 

M20 Metric coarse is 2.5mm, M20 electrical is 1.5mm pitch.

 

Imperial maybe? 4 threads covering a 1/4" gives 16tpi and then the nom. 0.8' OD.

 

I reckon 3/4-16 UNF. Sounds about right as Starrett arbours are UNF. 

 

 

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3/4"-16 UNF tap is a bit sloppy...or is it?

 

IMG_20200818_130314346.thumb.jpg.a34339caca421d70995866e895dd8b92.jpg

 

Maybe it's meant to be to aid getting it apart on site? Looking down the bore of the core cutter and tbh the tap teeth don't seem to be lining up that well...

 

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@PeterW wins tonight's (priceless) prize! It is indeed 1/2" BSP. I didn't even consider it as a possibility, I mean it's for "pipe"! I didn't even consider it with the Zeus book sat in front of me.

 

IMG_20200818_172554521.thumb.jpg.45ab641f31b5cba9f405637363f53c2f.jpg

 

Good to know. However, as the other adapter I made is M16 I did the same with this in the end. Fully threaded the arbour length & found a couple of stud extenders and half nuts:

 

IMG_20200818_201028060.thumb.jpg.cfc0aaf198dbfe0200b6cd6728e0e5d9.jpg

 

IMG_20200818_201118400.thumb.jpg.6882fc84d8c035ee67c756967e4ebb12.jpg

 

 

 

 

 

 

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Going double off topic this reminds me of a famous family story from my niece (who is just going into final year at uni).

 

(You need to know that in North Nottinghamshire 'aitches 'ardly ever 'appen.)

 

Announcement from darling sister to family: "We are going to have an arbour for the garden."

Niece: "With ships?"

 

(Gets coat and exits, pursued by a bear.)

Edited by Ferdinand
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