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----- Reply message ----- From: [email protected] To: <[email protected]> Subject: Emc-users Digest, Vol 113, Issue 18 Date: Mon, Sep 7, 2015 5:55 PM Send Emc-users mailing list submissions to [email protected] To subscribe or unsubscribe via the World Wide Web, visit https://lists.sourceforge.net/lists/listinfo/emc-users or, via email, send a message with subject or body 'help' to [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of Emc-users digest..." Today's Topics: 1. Re: Machining a servo motor shaft. (Gene Heskett) 2. Re: Machining a servo motor shaft. (john mcintyre) 3. Re: Lathe conversion to all metal gearing and sprockets (Gene Heskett) 4. Re: Machining a servo motor shaft. (rayj) 5. SCARA Kinematics WTF!? (Carsten Presser) 6. Re: Machining a servo motor shaft. (Jason Burton) ---------------------------------------------------------------------- Message: 1 Date: Mon, 7 Sep 2015 07:49:40 -0400 From: Gene Heskett <[email protected]> Subject: Re: [Emc-users] Machining a servo motor shaft. To: [email protected] Message-ID: <[email protected]> Content-Type: Text/Plain; charset="iso-8859-1" On Monday 07 September 2015 06:09:42 andy pugh wrote: > I have a motor that would be about right for my lathe conversion, if > it didn't have a brake on the back. (a nice short motor is useful for > a Lathe X axis). > > I am considering re-machining the rotor shaft and the end cover to > make it into a shorter motor without a brake. > > The problem, clearly, will be that all the swarf will want to stick to > the magnet. My idea is to wrap it in masking tape and then duct tape, > do the machining, add another layer of duct-tape to immobilise any > remaining swarf, then cut it all off. > > Does anyone have a better idea? If the brake can be removed but leave the shaft, it would make a great place to put a damper on it. Not that x normally needs the speed because of the short travel range, but... And I can't think of a better way to keep the swarf out of it than what you are describing. I'd likely do the same. 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> ------------------------------ Message: 2 Date: Mon, 7 Sep 2015 22:17:26 +1000 From: john mcintyre <[email protected]> Subject: Re: [Emc-users] Machining a servo motor shaft. To: "[email protected]" <[email protected]> Message-ID: <[email protected]> Content-Type: text/plain; charset="iso-8859-1" Good day I usually if possible wrap the shaft in a heavy plastic sheet first, as the adhesive tends to cling to the swarf ,then wrap duct-tape over the lot. Regards john > From: [email protected] > Date: Mon, 7 Sep 2015 11:09:42 +0100 > To: [email protected] > Subject: [Emc-users] Machining a servo motor shaft. > > I have a motor that would be about right for my lathe conversion, if > it didn't have a brake on the back. (a nice short motor is useful for > a Lathe X axis). > > I am considering re-machining the rotor shaft and the end cover to > make it into a shorter motor without a brake. > > The problem, clearly, will be that all the swarf will want to stick to > the magnet. My idea is to wrap it in masking tape and then duct tape, > do the machining, add another layer of duct-tape to immobilise any > remaining swarf, then cut it all off. > > Does anyone have a better idea? > > -- > atp > If you can't fix it, you don't own it. > http://www.ifixit.com/Manifesto > > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------ Message: 3 Date: Mon, 7 Sep 2015 13:12:04 -0400 From: Gene Heskett <[email protected]> Subject: Re: [Emc-users] Lathe conversion to all metal gearing and sprockets To: [email protected] Message-ID: <[email protected]> Content-Type: Text/Plain; charset="iso-8859-1" On Monday 07 September 2015 07:33:16 Gene Heskett wrote: > On Monday 07 September 2015 04:14:46 Erik Christiansen wrote: > > On 06.09.15 11:23, Gene Heskett wrote: > > > Finding the stuff locally or on the web is a problem though. > > > Henckle's own site isn't at all helpfull when the bury each > > > products info in an individual downloadable pdf. Nothing I could > > > find gave me something that resembles a recipe, where if you want > > > to do this, use this product sort of a list. > > > > Gene, the local homepage: > > http://www.loctite.com.au/loctite-Australia-and-New-Zealand.htm > > has on the LHS: "Products by Applications", which provides a pretty > > straightforward illustrated menu. OK, it is only at the bottom of > > the "retaining" page that 638/648/680 and "Learn More" appear, so > > some patient scanning is needed. Is there less at "www.loctite.com"? > > (Didn't see any 640 there. Beats me.) > > > > > A web search for loctite 626 returns nothing of use though. > > > > The first hit: > > http://www.henkelna.com/product-search-1554.htm?nodeid=8797952638977 > > > > has a "Technical Information" tab, which gives a basic but useful > > list of properties - enough to check whether it'll do for your > > thread size, applied torque, and operating temperature. (I just whiz > > off an email to 'em for anything more specific than that.) > > > > > Amazon says the high strength sleeve retainer is #640. 9 bucks a > > > 6ml tube. > > > > No hits for that on a site search, but a web search finds it on a > > Henkel page. It is a bit like spotlighting for rabbits in scrubby > > country - you catch the glint of their beady eyes in the spot, and > > the next instant they're round a tussock, and vanished in the > > shrubbery. > > > > Erik > > It sounds as though one should have a tube of each in the toolbox > drawer. > > So I'll see what NAPA can supply tomorrow. > > In the meantime the permagoo threadlocker red has been curing since > mid afternoon yesterday, and I am mentally going thru my midden heap, > trying to find a table riser I can use to bring the clamped up motor > up to a height I can reach on the z down limited GO704. And except > for a piece of wooden 4x4, or carving up a big block of alu, coming up > empty. > > By the time I get clamping pressure on the fitted flywheel holders I > made out of a full inch thick scrap of white ash yesterday, that piece > of 4x4 may as well be a wet kitchen sponge. Not rigid enough by a > long ways. > > Grizzly has a riser, but I don't think its tall enough at 3 & 9/16" > and its north of $200 by the time the freight is paid. And its a week > away. I may have to pay a visit to one of the local scrap yards for > raw materials. That has been fruitful in the past. I once bought a > nearly 40 lb block of aluminum, about 6.5x6.5" cross section about 20" > long that way. Been nibbling on that for smaller bit & pieces for a > while, but it would take quite a large bag to hold the swarf if I > sacrificed whats left of that, and its dead soft gummy stuff, wanting > to pack up the flutes of your tools way to easily. And I'm not yet > rigged for coolant on this mill. The table has a drain, but its way > to small at 1/4" bore and would be plugged with swarf in less than 2 > minutes. But I can see a small pool pump and a 5 gallon bucket of > water if I could figure out how to rust proof it. I assume there is > such a product. > > Humm, I wonder how long an aquarium pump would last pumping the usual > parts cleaner, aka K2 or similar? Has anybody tried that? I'll see > what TSC may have for small electric fuel pumps. A gravity feed > dribbling on the tool would help a lot, and a tanks, a 5ver on the > floor with a pickup 2/3rds of the way up the side, pumping into a > smaller one about 6 feet up and dribbling out of that might work. But > with K2 and its ilk, the fire people would have a whole litter of > elephants. So treated for rust prevention water would be better. > > I'm rambling and its time to go make some coffee to see if I can make > sense with my mutterings. :) So, I sawed about 2.5" off the end of the remainder and machined the top and bottom flat, although the first pass disclosed that I needed to take up the gibs, which I did, and now both faces sit nice & flat on the table. But the table slots lack about 1/8" of spacing on each side, forcing the bolts to the rear where they can get past the cooling fins. But that made me make a wedge block to put under the back of the motor because the lopsided grip on the smooth part of the flywheel angles it tail down about 5 degrees as I tighten the bolts. That seems solid enough but too much bolt draw could bend the motor shaft, so Its a balancing act. But I think its tight enough I can drill the holes _if_ the bit is sharpened first and I drill a small pilot hole first. After lunch as I have not yet rotated the head. But now its lunch time, gotta go see what my baby wants. And where I can get it today. > Cheers, Gene Heskett 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> ------------------------------ Message: 4 Date: Mon, 7 Sep 2015 11:56:10 -0500 From: rayj <[email protected]> Subject: Re: [Emc-users] Machining a servo motor shaft. To: "Enhanced Machine Controller (EMC)" <[email protected]> Message-ID: <[email protected]> Content-Type: text/plain; charset=windows-1252; format=flowed Someone mentioned using modelling clay for removing chips from magnets on this list earlier. I was thinking: Wrap it with cling wrap or maybe cover it with grease so the clay doesn't adhere and then cover it with clay. When finished, press all the swarf firmly into the clay and then remove the clay. Now that I've finished, I realize that the clay would probably get thrown off during the turning, but maybe the idea will lead to another solution. Back to lurking. Raymond Julian Kettle River, MN The things we admire in men, kindness and generosity, openness, honesty, understanding and feeling are the concomitants of failure in our system. And those traits we detest, sharpness, greed, acquisitiveness, meanness, egotism and self-interest are the traits of success. And while men admire the quality of the first they love the produce of the second. -John Steinbeck, novelist, Nobel laureate (1902-1968) On 09/07/2015 05:09 AM, andy pugh wrote: > I have a motor that would be about right for my lathe conversion, if > it didn't have a brake on the back. (a nice short motor is useful for > a Lathe X axis). > > I am considering re-machining the rotor shaft and the end cover to > make it into a shorter motor without a brake. > > The problem, clearly, will be that all the swarf will want to stick to > the magnet. My idea is to wrap it in masking tape and then duct tape, > do the machining, add another layer of duct-tape to immobilise any > remaining swarf, then cut it all off. > > Does anyone have a better idea? > ------------------------------ Message: 5 Date: Mon, 7 Sep 2015 23:14:27 +0200 From: Carsten Presser <[email protected]> Subject: [Emc-users] SCARA Kinematics WTF!? To: [email protected] Message-ID: <[email protected]> Content-Type: text/plain; charset="utf-8" Hi, Sorry for the long confusing post in advance. I am having some troubles with scarakins: For reference, a copy of my current config: https://ca.rstenpresser.de/~cpresser/20150907_linuxcnc-config-hirata-scara.tgz First of all, I dont know which Axes/Joints I need to define in both the ..ini and .hal files. The real machine has 4 Joints: http://i.imgur.com/bhsfqXk.jpg - Joint0: Inner Arm - Joint1: Outer Arm - Joint2: Linear Z-Axis - Joint3: Rotary C-Axis (rotates around the Z-Direction) In the example-config-ini-file the following AXIS are used: (/usr/share/doc/linuxcnc/examples/sample-configs/sim/axis/vismach/scara) - [AXIS_0] - [AXIS_1] - [AXIS_2] - [AXIS_5] The corresponding HAL-File however uses net J0pos <= axis.0.motor-pos-cmd net J1pos <= axis.1.motor-pos-cmd net J2pos <= axis.2.motor-pos-cmd net J3pos <= axis.3.motor-pos-cmd This does indeed match the 'scarakins.c' source file. A comment in line 73 says: /* joint[0], joint[1] and joint[3] are in degrees and joint[2] is in length units */ With the example-config the C-Axis is slow as hell. I tinkered around a litte and found that when I use axis.5.xxx for the C-Axis the speeds are okay. It looks like is isn't a good idea to use ini-entry [AXIS_5] with the axis.3.xxx-pins. But now I have axis.3.xx and axis4.xx unused. This makes linuxcnc unhappy, when trying to switch into world-mode it complains that those two axis aren't homed. So I added homing to those two axis, thats where I am now. Now switching into world mode actually works. But with errors, the GL-Preview isnt happy: http://nopaste.linux-dev.org/?755109 (I fixed that by uncommenting those lines) Now comes the FUN part. When I rotate the C-Axis by hand (servo amps disabled) the B-Axis-Value on the DRO changes. Video: https://ca.rstenpresser.de/~cpresser/MVI_2799.MOV Any Hints (besides not using scarakins!?) Kind Regards Carsten -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 834 bytes Desc: OpenPGP digital signature ------------------------------ Message: 6 Date: Mon, 7 Sep 2015 16:55:21 -0500 From: Jason Burton <[email protected]> Subject: Re: [Emc-users] Machining a servo motor shaft. To: "Enhanced Machine Controller (EMC)" <[email protected]> Message-ID: <CADaKHOvKK2uP6wJQOjqp4znEgwMoEBt6qvM5ktH5Nr=i9no...@mail.gmail.com> Content-Type: text/plain; charset=UTF-8 Assuming the bearings come off, maybe dip the end you are machining in hot paraffin? After it sets up it should make a fair chip dam. On Mon, Sep 7, 2015 at 11:56 AM, rayj <[email protected]> wrote: > Someone mentioned using modelling clay for removing chips from magnets > on this list earlier. > > I was thinking: Wrap it with cling wrap or maybe cover it with grease so > the clay doesn't adhere and then cover it with clay. When finished, > press all the swarf firmly into the clay and then remove the clay. > > Now that I've finished, I realize that the clay would probably get > thrown off during the turning, but maybe the idea will lead to another > solution. > > Back to lurking. > > Raymond Julian > Kettle River, MN > > The things we admire in men, kindness and generosity, openness, honesty, > understanding and feeling are the concomitants of failure in our system. > And those traits we detest, sharpness, greed, acquisitiveness, meanness, > egotism and self-interest are the traits of success. And while men > admire the quality of the first they love the produce of the second. > -John Steinbeck, novelist, Nobel laureate (1902-1968) > > On 09/07/2015 05:09 AM, andy pugh wrote: > > I have a motor that would be about right for my lathe conversion, if > > it didn't have a brake on the back. (a nice short motor is useful for > > a Lathe X axis). > > > > I am considering re-machining the rotor shaft and the end cover to > > make it into a shorter motor without a brake. > > > > The problem, clearly, will be that all the swarf will want to stick to > > the magnet. My idea is to wrap it in masking tape and then duct tape, > > do the machining, add another layer of duct-tape to immobilise any > > remaining swarf, then cut it all off. > > > > Does anyone have a better idea? > > > > > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------ ------------------------------------------------------------------------------ ------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users End of Emc-users Digest, Vol 113, Issue 18 ****************************************** ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
