http://www.todaysmachiningworld.com/forum/forum/screw-machine-issues Brought to you by Todays Machining World en-US Fri, 30 Jul 2010 03:04:50 +0000 http://bbpress.org/?v=1.0.2 q http://www.todaysmachiningworld.com/forum/search.php http://www.todaysmachiningworld.com/forum/topic/c038m-pickoff#post-675 Fri, 25 Sep 2009 12:58:50 +0000 Anonymous 675@http://www.todaysmachiningworld.com/forum/ <p>Has anyone ever adapted a C&#38;M pickoff to fit a 1 1/4 52 New Britian? We need a reliable solution to back chamfer and back machine a variety of parts on a Model 52 New Britian. </p> http://www.todaysmachiningworld.com/forum/topic/trouble-getting-close-enough-tolerance-on-acme-using-c12l14#post-39 Wed, 11 Feb 2009 06:10:08 +0000 Anonymous 39@http://www.todaysmachiningworld.com/forum/ <p>I have a customer who needs me to hold a .0005 tolerance ID on a part made with C12L14. I’ve been having trouble getting the tolerance close enough on my 6 spindle Acme bar machine. I’ve been trying for days to ream it up to specs, but I’ve never had to go this close before and I’m starting to run out of patience. Are there any tricks to getting the tolerance right. </p> http://www.todaysmachiningworld.com/forum/topic/high-pressure-coolant-for-screw-machines#post-278 Mon, 16 Mar 2009 14:23:40 +0000 Anonymous 278@http://www.todaysmachiningworld.com/forum/ <p>Can anyone recommend an add-on high pressure coolant system for a multiple-spindle screw machine? </p> http://www.todaysmachiningworld.com/forum/topic/axial-threadrolling#post-209 Thu, 05 Mar 2009 03:11:28 +0000 Anonymous 209@http://www.todaysmachiningworld.com/forum/ <p>How long a thread can be rolled with a axial 3 roll style thread head on a screw machine? We tried but get a very poor looking start, and the pitch diameter varied too much to run successfully. Tried a 1.125-12 thread 1.75 long in 1144 CD. Thread size what right in the middle of what the manufacturer rated the head for. Has anyone tried this? </p> http://www.todaysmachiningworld.com/forum/topic/trouble-getting-good-finish-on-1018-part-running-on-acme#post-55 Wed, 11 Feb 2009 19:00:20 +0000 Anonymous 55@http://www.todaysmachiningworld.com/forum/ <p>We are having trouble getting a reasonable finish on this 1018 part we are running on an Acme. The Bar stock is 15/16 diameter 1018 steel. The part is 3/4 long with profiles as deep as 1/4 inch on the fully turned OD. We have only 10 days to deliver these parts and the delivery for carbide is two to three weeks. Even if we could get the carbide sooner it would not be economical since this is only a 1500 piece job. With the high speed tool we are using, the micro is as high as 250. A 12 degree rake improved the finish slightly but we are still having problems with the material welding to the tool. We also tried a higher rake which gave us dimensional problems with our part. This high micro does not give the part a very crisp appearance and we don't feel the customer will accept this. </p> http://www.todaysmachiningworld.com/forum/topic/surface-finish-problem-material-gummy-welding-to-edges-of-tooling#post-51 Wed, 11 Feb 2009 16:40:07 +0000 Anonymous 51@http://www.todaysmachiningworld.com/forum/ <p>We are in a bind. We have a 1500 piece job that has to be delivered by<br /> the end of next week and we have yet to get the job to run to the surface<br /> finish we need. The part is about .750 inches long and formed up to .250 inches deep in<br /> some places. The material is gummy and is welding to the edges of our<br /> tooling. We have tried different rake angles with little luck and are<br /> looking for a quick and economical solution. </p> http://www.todaysmachiningworld.com/forum/topic/no-central-system-for-chips-and-oil-coolant-oil-is-mixing-with-hydraulic-oil#post-89 Fri, 13 Feb 2009 16:01:23 +0000 Anonymous 89@http://www.todaysmachiningworld.com/forum/ <p>We have a shop with 70 acme multi spindles, but we have no central system for chips and oil. In the course of the machining operation, our coolant oil mixes with the hydraulic oil. We are getting different results on similar machines using the same tooling. Is the mixing of the oils the cause of this? What should we do? </p> http://www.todaysmachiningworld.com/forum/topic/termanology-definition-concentricity-vs-run-out-vs-position-requirement#post-90 Fri, 13 Feb 2009 16:07:55 +0000 Anonymous 90@http://www.todaysmachiningworld.com/forum/ <p>We are a job shop manufacturing turned parts on screw machines and CNC lathes for a variety of customers and industries.</p> <p>On parts with multiple diameters some customers call out a concentricity specification. Others will use run-out and some show a position requirement. Aren’t they really all asking for the same thing? Why do they say it three ways, and can they be used interchangeably? </p> http://www.todaysmachiningworld.com/forum/topic/using-water-soluble-to-get-rid-of-stringy-chips-on-wickman#post-37 Wed, 11 Feb 2009 06:05:58 +0000 Anonymous 37@http://www.todaysmachiningworld.com/forum/ <p>We are a multi-spindle screw machine shop with Wickmans and Davenports. We have a job running 3/4” diameter, 1.5” long, drilled, tapped, and formed parts on Aluminum 6061. It’s a one time job running one million pieces at an hourly rate of $75.00 per hour. My problem is we keep getting long stringy balled chips, which bind the machine up, producing bad parts. Right now we are running the job on Wickmans using oil coolant. Would using water soluble coolant get rid of this problem? Are there drawbacks to using water soluble coolant on a multi? What should I do? </p>