On Friday 29 January 2016 08:10:09 John Alexander Stewart wrote: > Gene; > > I have quite a few sets of ER collets. My original ER25 ones are from > Regio Fix, and were expensive when I bought them. (Marcus is right...) > > They are by far the best collets. > > I have some ER-40s from Maritool in the USA. They seem fine, too. > > I have some precision ones from CTC Tools, that are "ok" but my go-to > collets are the Regio Fix ones in the ER-25 size. > > I have some cheapies from CTC Tools, like a 1/8, 1/4, 3/8 and 1/2. > (these are not their "precision" set) Fine for holding some of my inch > shanked tooling like drill chucks in the mill, or material that will > get turned down on the lathe. > > Marcus is also right about the smaller ends; my Regio-Fix ER-25 > collets go smaller than the CTC tools ones, and some ER-11 collets > from Arc Euro in the UK (they have parallel shank adapters) are, I > believe, half mm increments, but sold in 1mm increments, so about 1/2 > the small drills I can not hold.... (maybe it was my mistake on > purchase, but I should fill in that set sometime) > > BTW - about 80% of the time my lathes have ER collet holders on, 100% > of the time (and, I mean 100%) on the mills.
Thank you John. This discussion has been enlightening. As for ER's on my lathe, it would be difficult as I would have to start from a spindle face designed to interface with the machined pocket in the rear of a bolt mounted chuck. I had 2 of the 3 jaw variety on it but they were anywhere near centered, so its been wearing a 5" 4 jaw for quite a while, with a .0001" indicator used to adjust jaw by jaw for centering. A time sink to do that, but it works. I need a bigger lathe for sure, the spindle thru hole is too small by about an inch. I can't pass a rod of more than 3/4". It will happen if I don't expire first. :) > On Fri, Jan 29, 2016 at 6:32 AM, Gene Heskett <ghesk...@wdtv.com> wrote: > > On Friday 29 January 2016 04:12:24 Marcus Bowman wrote: > > > On 29 Jan 2016, at 06:32, Gene Heskett wrote: > > > > On Thursday 28 January 2016 23:25:05 Ken Strauss wrote: > > > >> Note that metric ER collet sets can grip any size in their > > > >> range. However, there are gaps with most sets of Imperial sized > > > >> collets. > > > > > > > > You are saying that a 3mm if comfortable with a 1/8" in it, and > > > > a 6mm can handle the 1/4"? > > > > > > No; that won't work. An ER series collet can only hold up to the > > > maximum stated size for that collet. After that, you must use the > > > next largest collet. So for a 1/8inch drill bit you must use the > > > 3-4mm collet. They are all marked with a range, and you must not > > > go above or below the stated sizes for each collet. > > > > > > You also need to be careful of the range you are buying. Some > > > suppliers sell sets which either (a) don't cover the range right > > > down to the smallest size for that range (so some ER11 sets don't > > > go below 1mm) and you would then need to buy additional collets to > > > complete the set. Or (b) some suppliers sell sets which cover the > > > full range but have too great a gripping range in the very small > > > sizes. So they sell 0.5-1mm, 1-2mm and 2-3mm etc. The better > > > approach is to use 0.5-1mm, 1-1.5mm, 1.5-2mm then rising in > > > increments of 1mm 2-3, 3-4 etc for the rest of the range. Note you > > > can't really go below 0.5mm (20 thou) because the collets are not > > > designed to close down that far. The specs for the ER11 range, > > > from the inventors of the concept are here: > > > https://www.rego-fix.com/en/home-north-america/products/collets-re > > >duct > > > ion-sleeves/er-collets/paction/list/pcontroller/Article/anext/1/re > > >direc ted/1/ptab/kind/size/er-11/kind/er-11-standard-mm.html > > > > > > If you go to: > > > https://www.rego-fix.com/en/home-north-america/products/er-system/ > > >er-c > > > ollets/paction/list/pcontroller/Article/anext/1/redirected/1/ptab/ > > >size/ size/er-11.html you will see there are different precision > > > ranges. I have not been able to find any for sale in the UK, but I > > > guess they would be, for me at least, largely unaffordable. Lots > > > of collets are sold in what we might term "value" sets. Despite > > > what the vendors are claiming, the runout is high, and, with sizes > > > as small as ER11 that can be very noticeable especially on smaller > > > sized tools. As someone else has noted (later post, I think), the > > > cost of a good set is relatively high, and can be twice the cost > > > of the cheap-as-chips sets commonly sold. There's a reason for > > > that, and my experience has taught me to buy the branded sets > > > (like Vertex, or the Swiss Rego_Fix originals) and just stump up > > > the cash. It makes a significant difference. My last set of ER11 > > > collets, delivered at the beginning of this week, and destined as > > > collets for a grinder, were all marked with both the metric sizes > > > and the imperial sizes gripped by each collet. Very handy. Cheap > > > sets were available for £11 (roughly 20 USD) or £48 (roughly > > > 90USD) and this set for £64 (roughly 110 USD). Ouch. Low runout is > > > fine by me, especially given the cost of small diameter carbide > > > cutters. > > > > > > Marcus > > > > Thanks for the tutorial, I appreciate it. Before all this > > discussion I've bought a $23 set of 9, so I don't expect ultra low > > runout. But it will take a while before I can exersize them. > > > > It looks like the only practical way to put it on the G0704 is to > > buy another head casting & machine to fit this 80mm motor. So thats > > the next step. Or sell this and buy the Sable, either the whole > > machine for $720 & ship from Taiwan, or just their spindle assembly > > for $99 & ship. But that only gives me 10k rpms, so the feed rates > > would still be under 8 ipm. As that one is a belt drive, I'd imagine > > the motor pulley size could be upped, but how long would the > > bearings last at 20k revs. TANSTAAFL applies here too. First, find > > out what the bare head casting for this one is worth. > > > > Thanks Marcus. > > > > Cheers, Gene Heskett > > -- > > "There are four boxes to be used in defense of liberty: > > soap, ballot, jury, and ammo. Please use in that order." > > -Ed Howdershelt (Author) > > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > > > -------------------------------------------------------------------- > >---------- Site24x7 APM Insight: Get Deep Visibility into Application > > Performance APM + Mobile APM + RUM: Monitor 3 App instances at just > > $35/Month Monitor end-to-end web transactions and take corrective > > actions now Troubleshoot faster and improve end-user experience. > > Signup Now! > > http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > ---------------------------------------------------------------------- >-------- Site24x7 APM Insight: Get Deep Visibility into Application > Performance APM + Mobile APM + RUM: Monitor 3 App instances at just > $35/Month Monitor end-to-end web transactions and take corrective > actions now Troubleshoot faster and improve end-user experience. > Signup Now! > http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
