August 16, 20206 yr 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?
August 16, 20206 yr 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
August 16, 20206 yr 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, 20206 yr by Nickfromwales
August 16, 20206 yr Author 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.
August 16, 20206 yr 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.
August 18, 20206 yr Author 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.
August 18, 20206 yr Author 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...
August 18, 20206 yr Author 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!
August 18, 20206 yr @Onoff1/2” BSP according to this which would match up with your dimensions as it’s 20.9mm and 14 TPI
August 18, 20206 yr Author 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.
August 18, 20206 yr Author @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:
August 18, 20206 yr 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, 20206 yr by Ferdinand
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