May they rust in peace.
I once worked at a factory making Chinese typewriters, the job was lousy but there were plenty of characters.
Hmmm - it was a German ship, but did not see any DHL labels - wonder if they will announce another KFC chicken shortage...!
I have the full (metric) ER32 set from Arc and a range of chucks for the lathe, tailstock and mill. They seem fine, grip well and have remained concentric & axial (which essentially covers my complete requirement set for collets). I have the ER32 myford collet chuck which RDG sell - it comes in two parts so you can mount the backplate, turn the spigot concentric and then bolt the collet chuck on to get the best concentricity. I did this with the compound laid over to about 80 degrees so I could take extremely fine cuts, and the resulting spigot fit is as near perfect as I've ever achieved. I have some 10mm PGMS bar, and when I hold that in a 10mm collet in that ER chuck I get no measurable runout on any of my DTIs, so I'm quite happy.
As far as I'm concerned the big advantage of the ERs is,as Jason alluded, that they are spring collets which cover a range of diameters rather than fixed collets that essentially only work for the specific size. So if you bought 5C collets in 1,2,3,4,5,6,7,8,9 &10mm sizes you could grip bar that was 1,2,3,4,5,6,7,8,9 or 10mm diameter. But if you wanted to hold 1/8", 1/4", 10-swg or even just 5.5mm bar you'd have to go and buy the specific collet in that size. But if you bought the set of ER32 collets (2-20mm) you could hold ANY diameter between 2mm and 20mm. So you don't need a separate inferial set - you can hold 1/8" or 10swg in the 3.5mm collet and 1/4" in the 7mm, and if you need to hold 5.5mm bar you just use a 6mm collet. One set fits all!
Thanks Alan, I have bought individual collets from Arceuro to supplement my ER25 milling set and I thought they seem to do a decent job. I cant really see me damaging them so I'm inclined to think of them as a one off purchase.
And with oversize ER 32 collets you can hold even bigger, handy for 24mm pistons.
As I Use as many metric cutters as I do metric I also have the smaller range of imperial ER32 as it is easier than closing metric ones right down.
How do you manage to hold larger than 20mm ?
In addition to oversize ER32 collets they do some nice oversize ER25 collets.
The normal ER25 range stops at 16mm, Gloster offer oversize collets up to 20mm.
Hm. I'm wondering if my aircraft drill bits were on that ship. Got a notice that the vendor hadn't received them as expected and it would be a while longer before my order was filled.
The other criticisms are that the slotting depth for the rear contraction slots are all over the place No two collets seem to have the slots to the same depth when you look on the front face - A European manufacturer would have rejected these on grounds of that being an indication of inconsistent quality. And don't get me on why they have at least 3 different numbering fonts.
Hi Jo, I'm getting confused are these the £21 set of ebay ? Are you comparing them to the Arceuro £87 set ?
I'm expecting a set of collets to be a one off purchase that will last so I'd rather pay a bit more to get decent ones.
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