Dr_GMJN | 28/01/2022 10:21:32 |
![]() 1602 forum posts | Posted by Michael Gilligan on 28/01/2022 09:37:18:
Posted by Dr_GMJN on 28/01/2022 08:25:44:
Posted by JasonB on 28/01/2022 07:19:19:
[…] Has the Myford got a through hole […] Yes, the tailstock MT2 taper is hollow if that’s what you mean? […] . Hence my [presumably inappropriate] suggestion, yesterday.
Sorry Michael, I thought you suggested a method of using a hollow MT2 taper and making some kind of sliding arrangement, or the tailstock mechanism you linked to. You didn't mention a collet? Jason I think was suggesting a simple tailstock collet to hold the ARC supplied sensitive chuck - thus reducing overhang and weight of having a second chuck to hold the first? Unless I've misunderstood, these are two completely different concepts in terms of cost and complexity? |
JasonB | 28/01/2022 12:07:03 |
![]() 25215 forum posts 3105 photos 1 articles | Yes an MT2 collet closed by a simple cobbled together draw bar would hold the attachment with minimal overhang. |
IanT | 28/01/2022 12:13:55 |
2147 forum posts 222 photos | Posted by Dr_GMJN on 28/01/2022 08:25:44:
Posted by JasonB on 28/01/2022 07:19:19:
Has the Myford got a through hole so you could use a MT2 x 1/2" collet Yes, the tailstock MT2 taper is hollow if that’s what you mean? Presumably I’d need a draw bar then? Thanks. When I first obtained my 'sensitive' drill chuck - I used it held in an MT2 - 1/2" end-mill holder (the tool itself being secured by a grubscrew) to mount in my S7s tailstock - and it worked fine without a drawbar. It also helped to extend the device over the cross-slide btw. There's enough 'grip' in a well fitting MT2 taper to not mind the sprung drill being moved in & out. My issue with the device was that mine had a lot of slop when extended. You could buy the device and fit it into a MT2 blank arbor by drilling the arbor to suit the diameter of the sliding part of the chuck mount but that would seem a relatively expensive approach to the problem... Regards, IanT
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Dr_GMJN | 28/01/2022 12:18:42 |
![]() 1602 forum posts | Posted by JasonB on 28/01/2022 12:07:03:
Yes an MT2 collet closed by a simple cobbled together draw bar would hold the attachment with minimal overhang. Yep, that combination sounds exactly what I was after. For the drawbar I expect a rod threaded at one end for the collet, and a hollow stepped brass plug to fit into the other end of the tailstock ram would do. Then make some kind of tommy bar thing to turn it? The job I have in mind is the 0.25 mm diameter hole in the apex of the aluminium cones I mentioned on another thread. I have some PCB drills, so the ARC key chuck capacity should be OK, although it's a shame it doesn't close further. |
JasonB | 28/01/2022 12:28:32 |
![]() 25215 forum posts 3105 photos 1 articles | I'd put the hole into the faced off bar not try and drill the apex. Turn the taper after drilling. |
Dr_GMJN | 28/01/2022 13:18:12 |
![]() 1602 forum posts | Posted by JasonB on 28/01/2022 12:28:32:
I'd put the hole into the faced off bar not try and drill the apex. Turn the taper after drilling. Yes, I was just describing the end result rather than proposing trying to drill at an apex. |
Michael Gilligan | 28/01/2022 13:18:37 |
![]() 23121 forum posts 1360 photos | Posted by Dr_GMJN on 28/01/2022 10:21:32:
Posted by Michael Gilligan on 28/01/2022 09:37:18:
Posted by Dr_GMJN on 28/01/2022 08:25:44:
Posted by JasonB on 28/01/2022 07:19:19:
[…] Has the Myford got a through hole […] Yes, the tailstock MT2 taper is hollow if that’s what you mean? […] . Hence my [presumably inappropriate] suggestion, yesterday.
Sorry Michael, I thought you suggested a method of using a hollow MT2 taper and making some kind of sliding arrangement, or the tailstock mechanism you linked to. You didn't mention a collet? Jason I think was suggesting a simple tailstock collet to hold the ARC supplied sensitive chuck - thus reducing overhang and weight of having a second chuck to hold the first? Unless I've misunderstood, these are two completely different concepts in terms of cost and complexity? . Just to be clear … What I was suggesting [and the reason behind my using those selective quotations] was to bore a MT blank to accept a free-sliding shaft which accepts watchmaker’s collets. The mechanism shown in the Bergeon example is, to my mind, ‘optional’ … at small diameters, pushing with a fingertip should suffice, and is the most ‘sensitive’ feed mechanism available. MichaelG.
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