On Thursday 03 March 2016 09:06:40 John Alexander Stewart wrote: > Gene; > > Smart move. > > My ER collet chucks reside on my mills, and almost never get removed. > (boring head, cutoff saw, but do not have a drill chuck that fits the > spindles) > > I do have some smaller drill chucks (expensive, good) that I have on > parallel shanks, trimmed so that they will go into an ER collet, and > bottom out, but not stick out too much, maybe 2-3mm. The shanks I have > are 1/2", so fit well within an 13-12mm collet. > > Sometimes it is nice to have a (good) drill chuck for the smaller > drills, otherwise sometimes 3 hands are required (hold drill, keep > spindle from rotating, tighten ER collet nut) > > John.
BTDT, made a pin type spindle brake. Works well, but isn't always ultra handy. Biggest nuisance is turning the spindle to find the locking hole. I've considered putting in an orient module to do that, enabled when the spindle has stopped, but my encoder is a bit coarse for that as I'd have to figure out a way to make it hunt about the correct position & let the pin drop in as the hole goes by at 20 revs. The bearings are going to hell in the head, couple weeks of 24/7 equ of 125% top speed on them now, so I am going to have to get some top quality replacements for all the ball bearing in the back gear setup, and watch hoss's video on replaceing the tapered rollers in the spindle itself with ball bearings too. Its beginning to sound as if one or more of the $0.65 ball bearings on the countershaft is eating its cage material, drowning out any gear noises. My drive conversion, with its somewhat higher speed capability, probably isn't helping. The OEM controller was set to turn 2250 fwd, about 1100 in reverse. Would not have been ideal to control with LCNC, so one of Jon Elsons servo drivers, and about 2kw worth of 126 volt dc for that (that's the one I have to soft start else it trips the sevice breaker), and it can do right at 2800 in either direction. Direction changes were so brutal that I put an accel limit module in the control path in the hal file, but it can still switch directions, probably current limited to around 175% of the motors draw in the servo, from 2500 fwd to 2500 in reverse in just one fat second. At 300 revs, pecking a 3mm tap about 1/2 turn farther each time, with an extra pause while out of the hole for tap cleaning and a drop of buttercutt, I can tap a hole as deep as the taps active threads are long in hard alu or cast or ductile iron. At 300 revs, when the g33.1 hits the reverse, its just a click and its backing out. That crooked chucks excessive runnout is a tap breaker though, already busted one for me. It took a while for the garage air to clear of its blue tint after that. :( It has occurred to me that I have a second chuck the same size, also chinese, that came with the tool kit for the 7x12, with a j3-mt3 spud in it. I may see if I can drive the spud out of both & see it it will run any truer than this one when on the r8 spud. I am assuming a drift punch can reach the inner face of the spud to bounce them out? IDK, haven't taken a penlight and looked. If I get to the garage today, thats the 2nd thing I'll do, first of course being finding a suitable place to park my coffee cup. My back got overworked a couple days back, I spent yesterday in the "body" shop, and a new medication I started last night hasn't yet kicked in. So my progress today is both slow and carefull, even the coffee cup is too heavy when full. Even half the runnout this one has would be a marked improvement. 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=272487151&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
