You comment about McMaster Carr is right on target. Their sales office NEVER closes. They do have good quality material, and they somehow get it to you in record time..... If you know someone who is a regular customer, they get a new catalog about every six months, ask to get the old one. It is really a great reference book, not quite as good as the Ducommun Supply catalog, but they are still in business.
----- Original Message ----- From: emc-users-requ...@lists.sourceforge.net To: emc-users@lists.sourceforge.net Sent: Sunday, November 3, 2013 12:39:17 PM Subject: Emc-users Digest, Vol 91, Issue 13 Send Emc-users mailing list submissions to emc-users@lists.sourceforge.net 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 emc-users-requ...@lists.sourceforge.net You can reach the person managing the list at emc-users-ow...@lists.sourceforge.net When replying, please edit your Subject line so it is more specific than "Re: Contents of Emc-users digest..." Today's Topics: 1. Re: G33.1 probem (Gene Heskett) 2. Re: G33.1 probem (John Kasunich) 3. Re: G33.1 probem (Gene Heskett) 4. Re: Rotary stage (Eric Keller) 5. Re: G33.1 probem (Jon Elson) 6. Re: G33.1 probem (Dave Cole) ---------------------------------------------------------------------- Message: 1 Date: Sun, 3 Nov 2013 13:27:44 -0500 From: Gene Heskett <ghesk...@wdtv.com> Subject: Re: [Emc-users] G33.1 probem To: emc-users@lists.sourceforge.net Message-ID: <201311031327.44117.ghesk...@wdtv.com> Content-Type: Text/Plain; charset="windows-1256" On Sunday 03 November 2013 12:58:44 John Thornton did opine: > You only peck tap when doing it by hand. When you machine tap you always > go all the way in and back out. It is wise to use good quality taps and > inspect the first few cutting edges with a strong glass before use to > look for signs of wear like cupping. > > JT I can appreciate that John, but my excuse is that I am at least 200 miles from anyplace I can buy a 'quality' tap that I can eyeball for edge etc before I drop the card for a 10 pack, one thats strong enough to do that. So my local tap suppliers all stock the cheapest they can get, crap aimed for the beginner hobby market. Today's Hansen is a piece of crap made from cast iron, anything with a black nitride coating will be both the wrong size and not sharp enough to seriously damage a stick of margarine. So I use what I can get that looks sharp, which is usually the nitrided Mibro. But while they seem to be hard enough, and sharp enough, and are generally the right size, the chip gulleys are too shallow and it will be chip bound in 2 turns. So I am forced to peck regardless of how its being driven, blowing it clean on the backout & if theres enough pause, a drop of cutting oil. Now if someone knows where I can buy an 8-32 tap that can tap an 8-32 blind hole pre-drilled .250" deeper than the needed threads, tapped as deep as the tap is long and do it repeatedly for a dozen holes before I am rigging to EDM its broken pieces out of the hole, I am all ears. And it may have to do it in a piece of tool steel right out of the paper sleeve. > On 11/2/2013 3:50 PM, Gene Heskett wrote: > > However, this doesn't answer the question about anyone else having > > written a "peck cycle" using the G33.1 routine and had it work > > perfectly, or if they too had encountered a duck that walks & quacks > > like this one. Thanks Gregg. Cheers, Gene Thanks John. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) It is better to be bow-legged than no-legged. A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------ Message: 2 Date: Sun, 03 Nov 2013 13:37:12 -0500 From: John Kasunich <jmkasun...@fastmail.fm> Subject: Re: [Emc-users] G33.1 probem To: emc-users@lists.sourceforge.net Message-ID: <1383503832.26287.42370113.0d783...@webmail.messagingengine.com> Content-Type: text/plain On Sun, Nov 3, 2013, at 01:27 PM, Gene Heskett wrote: > > I can appreciate that John, but my excuse is that I am at least 200 miles > from anyplace I can buy a 'quality' tap that I can eyeball for edge etc > before I drop the card for a 10 pack, one thats strong enough to do that. Gene: You really need to get familiar with the McMaster Carr website. They tend to sell decent quality stuff, and even if you are so far back in the woods that they have to ship in sunshine, I'm sure UPS will deliver. (In fact, UPS probably brings in the sunshine.) McMaster ships from Aurora Oh, so it is probably only 2 days from you. -- John Kasunich jmkasun...@fastmail.fm ------------------------------ Message: 3 Date: Sun, 3 Nov 2013 14:31:19 -0500 From: Gene Heskett <ghesk...@wdtv.com> Subject: Re: [Emc-users] G33.1 probem To: emc-users@lists.sourceforge.net Message-ID: <201311031431.19958.ghesk...@wdtv.com> Content-Type: Text/Plain; charset="windows-1256" On Sunday 03 November 2013 13:56:49 John Kasunich did opine: > On Sun, Nov 3, 2013, at 01:27 PM, Gene Heskett wrote: > > I can appreciate that John, but my excuse is that I am at least 200 > > miles from anyplace I can buy a 'quality' tap that I can eyeball for > > edge etc before I drop the card for a 10 pack, one thats strong > > enough to do that. > > Gene: > > You really need to get familiar with the McMaster Carr website. They > tend to sell decent quality stuff, and even if you are so far back in > the woods that they have to ship in sunshine, I'm sure UPS will > deliver. (In fact, UPS probably brings in the sunshine.) McMaster > ships from Aurora Oh, so it is probably only 2 days from you. While I have bought some stuff from McMaster Carr, its more because they may be the only ones stocking what I need. Either way their prices are astoundingly high. Take a nook bronze nut for 1/2" 10 tpi ACME thread, with a 3/4" OD, 11 tpi thread (IIRC) on the outside, so you can use two and adjust easily for very low backlash. 8 or 9 years ago when I bought them and a stick of black oxide coated, 1/2 10 tpi acme rod, those 3 pieces were just south of $175. And UPS bent the bolt, about 1/8" in its length. I straightened it as best I could and used it. I should have bought a Chinese ball screw for about that money. A longer one for the lathe was only $138 delivered to my front deck this past summer. They may have it, but their search engine sucks, worst in the business and if you do manage to find it, they are 2x to 4x too proud of it in the $/item column. When I paid nearly $80 for two timing belt pulleys for the same Z drive, I expected a decent finish, and got what looked like sand castings I had to finish boring to size. Consequently, M-C has been my source of last resort, not my first goto place. And maybe I'm just in a bad mood, its looking more & more as if I'll have to find about 35 large for a new knee if I want to walk well again. I can find it if I have to, but that will about wipe us out. Then how long will I get to use it is the next question. As a type 2 diabetic, and 79yo, I am statistically well past my use by date already. So we wait & see. Sigh... Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) For every credibility gap, there is a gullibility fill. -- R. Clopton A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------ Message: 4 Date: Sun, 3 Nov 2013 14:53:05 -0500 From: Eric Keller <eekel...@psu.edu> Subject: Re: [Emc-users] Rotary stage To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Message-ID: <CANEU9Uw5vVn0hQe3+RWLUcWK-CTGJopPsLQHjEffkU=tbod...@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1 I'm too lazy to get an igs viewer, is it a harmonic drive? I have a pile of harmonic drives in the basement off of a robot I bought cheap. On Sun, Nov 3, 2013 at 10:49 AM, Stuart Stevenson <stus...@gmail.com> wrote: > it is a cycloidal drive > > > On Sun, Nov 3, 2013 at 7:32 AM, Marius Liebenberg > <mar...@mastercut.co.za>wrote: > >> Andy, >> I am busy with such a design. I think it is called an Orbital drive. I >> have not cut any parts yet but will start soon. Can you share your >> experiences with this idea? >> >> On 2013/11/03 12:53 AM, andy pugh wrote: >> > On 2 November 2013 19:47, Stuart Stevenson <stus...@gmail.com> wrote: >> >> Andy, >> >> this is my idea of a rotary drive >> >> >> >> https://www.dropbox.com/s/jbc53qf9dx4cxjp/rotarycurvic.igs >> > I think I tried to build something like that once, in fact I was >> > hoping to use it in a product. >> > Mine was an internal gear driving a spur gear with two teeth fewer. >> > The idea was for the internally-toothed gear to wobble in a small >> > circle. (driven by an eccentric on a motor). >> > >> > I was mainly trying for a very thin drive, at the time. >> > I think we gave up on it eventually, as I had a plan B that involved a >> > bit less invention. >> > >> >> -- >> Regards / Groete >> >> Marius D. Liebenberg >> MasterCut cc >> Cel: +27 82 698 3251 >> Tel: +27 12 743 6064 >> Fax: +27 86 551 8029 >> Skype: marius_d.liebenberg >> >> >> --- >> This email is free from viruses and malware because avast! Antivirus >> protection is active. >> http://www.avast.com >> >> ------------------------------------------------------------------------------ >> >> Android is increasing in popularity, but the open development platform that >> developers love is also attractive to malware creators. Download this white >> paper to learn more about secure code signing practices that can help keep >> Android apps secure. >> http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.clktrk >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > > > -- > Addressee is the intended audience. > If you are not the addressee then my consent is not given for you to read > this email furthermore it is my wish you would close this without saving or > reading, and cease and desist from saving or opening my private > correspondence. > Thank you for honoring my wish. > Just for you NSA - think autointercourse > terrorist suitcase bomb sarin > hello > ------------------------------------------------------------------------------ > > Android is increasing in popularity, but the open development platform that > developers love is also attractive to malware creators. Download this white > paper to learn more about secure code signing practices that can help keep > Android apps secure. > http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------ Message: 5 Date: Sun, 03 Nov 2013 13:54:57 -0600 From: Jon Elson <el...@pico-systems.com> Subject: Re: [Emc-users] G33.1 probem To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Message-ID: <5276aa11.3090...@pico-systems.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Gene Heskett wrote: > Now if someone knows where I can buy an 8-32 tap that can tap an 8-32 blind > hole pre-drilled .250" deeper than the needed threads, tapped as deep as > the tap is long and do it repeatedly for a dozen holes before I am rigging > to EDM its broken pieces out of the hole, I am all ears. And it may have > to do it in a piece of tool steel right out of the paper sleeve. > I buy 5 or so at a time from MSC, J&L, KBC and similar outfits. For shallow holes or thin sheet material, I use spiral FLUTE taps, they bring the chips up the hole just like a twist drill. Fantastic! But, on deep holes, they will bind up with chips and break sometimes. So, for those I often use spiral point taps. I did a fixture plate in 3/8" aluminum with 288 10-32 holes in one setup, with rigid tapping. The tap is still about as sharp as when new! Jon ------------------------------ Message: 6 Date: Sun, 03 Nov 2013 15:40:15 -0500 From: Dave Cole <linuxcncro...@gmail.com> Subject: Re: [Emc-users] G33.1 probem To: emc-users@lists.sourceforge.net Message-ID: <5276b4af.3040...@gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Spiral point taps are made for through hole tapping.. they tend to push the chips ahead of the tap. Not good for a blind hole. http://www.shars.com/product_categories/view/2160902/HSS_Spiral_Point_TapsPlug_Style Spiral flute taps work well for blind holes. http://www.grainger.com/Grainger/WIDIA-GTD-Spiral-Flute-Tap-1TRK6?Pid=search http://www.shars.com/product_categories/view/807222403/HSS_HiSpiral_Flute_Tap_USA Not cheap though... Dave On 11/3/2013 2:54 PM, Jon Elson wrote: > Gene Heskett wrote: >> Now if someone knows where I can buy an 8-32 tap that can tap an 8-32 blind >> hole pre-drilled .250" deeper than the needed threads, tapped as deep as >> the tap is long and do it repeatedly for a dozen holes before I am rigging >> to EDM its broken pieces out of the hole, I am all ears. And it may have >> to do it in a piece of tool steel right out of the paper sleeve. >> > I buy 5 or so at a time from MSC, J&L, KBC and similar outfits. > For shallow holes or thin sheet material, I use spiral FLUTE taps, > they bring the chips up the hole just like a twist drill. Fantastic! > But, on deep holes, they will bind up with chips and break sometimes. > So, for those I often use spiral point taps. I did a fixture plate in > 3/8" aluminum with 288 10-32 holes in one setup, with rigid tapping. > The tap is still about as sharp as when new! > > Jon > > ------------------------------------------------------------------------------ > > Android is increasing in popularity, but the open development platform that > developers love is also attractive to malware creators. Download this white > paper to learn more about secure code signing practices that can help keep > Android apps secure. > http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------ ------------------------------------------------------------------------------ Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.clktrk ------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users End of Emc-users Digest, Vol 91, Issue 13 ***************************************** ------------------------------------------------------------------------------ Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
