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seriously, look it up, this has been dispelled so many times here. 20mm (which the Alexander 2CGD uses) U2/E355 collets are plentiful, metric and imperial. https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20220527083213&SearchText=u2+colletGood luck in getting Deckel style collets. Sizing is limited on these. Vertex has them listed in their Catalog.
Because you are making your own you can dispense with the buttress thread and save a bunch of puzzling/effort, just make a matching nut.As long as they are the 20mm collets. To the best of my knowledge and searching, nobody is producing the 16mm ones. Apparently you can get them custom made, but I am sure that the cost will be significant. I'm trying to position myself to be able to make a few of them myself......one day, providing I live long enough.....
Here is the irony, first we dump on Asian machines because the quality isn't the same and yet AliExpress and other sources provide good Asian quality.seriously, look it up, this has been dispelled so many times here. 20mm (which the Alexander 2CGD uses) U2/E355 collets are plentiful, metric and imperial. https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20220527083213&SearchText=u2+collet
I have bought a bunch of these, excellent quality. For the in-between size you buy a ER16/ER20 16 mm straight collet chuck and a matching 16mm U2 collet. Shorten the ER16 shank and you are done for all the other sizes. That handles drill bits etc.
Endmills are generally nominal size such as 1/8,1/4,3/8, collets are available from AliExpress. Metric of course as well in 1mm increments.
Here is the irony, first we dump on Asian machines because the quality isn't the same and yet AliExpress and other sources provide good Asian quality.
Just pointing it out.
I have those collets you speak of...... They don't fit. The body of the collet is 16mm not 20mm..... Bigger hammer I suppose......seriously, look it up, this has been dispelled so many times here. 20mm (which the Alexander 2CGD uses) U2/E355 collets are plentiful, metric and imperial. https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20220527083213&SearchText=u2+collet
I have bought a bunch of these, excellent quality. For the in-between size you buy a ER16/ER20 16 mm straight collet chuck and a matching 16mm U2 collet. Shorten the ER16 shank and you are done for all the other sizes. That handles drill bits etc.
Endmills are generally nominal size such as 1/8,1/4,3/8, collets are available from AliExpress. Metric of course as well in 1mm increments.
But we already knew that your Alexander is older 16mm style I made drawings of the indeixing ring etc parts for someone in the UK who was missing them, you could upgrade with a new head and go 20mm For the machine that started this thread the 20mm will fit.I have those collets you speak of...... They don't fit. The body of the collet is 16mm not 20mm..... Bigger hammer I suppose......