Onoff Posted August 16, 2020 Share Posted August 16, 2020 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? Link to comment Share on other sites More sharing options...
Vijay Posted August 16, 2020 Share Posted August 16, 2020 you can just bring it back with Toolstation and get a refund or just bring the core cutter in store and try it, don't think the staff would care too much if you wanted to make sure it screwed in Link to comment Share on other sites More sharing options...
Nickfromwales Posted August 16, 2020 Share Posted August 16, 2020 (edited) 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 August 16, 2020 by Nickfromwales 1 Link to comment Share on other sites More sharing options...
Onoff Posted August 16, 2020 Author Share Posted August 16, 2020 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. Link to comment Share on other sites More sharing options...
Nickfromwales Posted August 16, 2020 Share Posted August 16, 2020 14 minutes ago, Onoff said: 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. They’ll all use the same arbor. Link to comment Share on other sites More sharing options...
Onoff Posted August 16, 2020 Author Share Posted August 16, 2020 That fits! ? Thinking I need a long extension though... Link to comment Share on other sites More sharing options...
Onoff Posted August 18, 2020 Author Share Posted August 18, 2020 Trying to knock up a really long extension bar for this core cutter. in 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. Link to comment Share on other sites More sharing options...
Onoff Posted August 18, 2020 Author Share Posted August 18, 2020 3/4"-16 UNF tap is a bit sloppy...or is it? 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... Link to comment Share on other sites More sharing options...
PeterW Posted August 18, 2020 Share Posted August 18, 2020 7/8 14 UNF..?? 1 Link to comment Share on other sites More sharing options...
Reiver Posted August 18, 2020 Share Posted August 18, 2020 Why not ring Mexco and ask what the thread is? 0845 602 4274 Link to comment Share on other sites More sharing options...
Onoff Posted August 18, 2020 Author Share Posted August 18, 2020 9 minutes ago, Reiver said: Why not ring Mexco and ask what the thread is? 0845 602 4274 Could do, I bet they'll tell me to BUY an extension! Link to comment Share on other sites More sharing options...
PeterW Posted August 18, 2020 Share Posted August 18, 2020 @Onoff1/2” BSP according to this which would match up with your dimensions as it’s 20.9mm and 14 TPI 1 Link to comment Share on other sites More sharing options...
Onoff Posted August 18, 2020 Author Share Posted August 18, 2020 1 hour ago, PeterW said: @Onoff1/2” BSP according to this which would match up with your dimensions as it’s 20.9mm and 14 TPI Cheers. I've a 1/2" BSP tap I think. Fingers crossed. Link to comment Share on other sites More sharing options...
Onoff Posted August 18, 2020 Author Share Posted August 18, 2020 @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. 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: Link to comment Share on other sites More sharing options...
Ferdinand Posted August 18, 2020 Share Posted August 18, 2020 (edited) 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 August 18, 2020 by Ferdinand Link to comment Share on other sites More sharing options...
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