tag:blogger.com,1999:blog-1592992209402300549.post7590496782328449181..comments2024-03-28T08:06:43.198-04:00Comments on The Silicon Graybeard: Weekly Update on the 1 by 1 - Part 26SiGraybeardhttp://www.blogger.com/profile/00280583031339062059noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-1592992209402300549.post-35566133434255082562022-05-08T16:55:10.400-04:002022-05-08T16:55:10.400-04:00Got yourself a con rod, SiG! Very nicely done.Got yourself a con rod, SiG! Very nicely done.drjimhttps://www.blogger.com/profile/05647484115197408897noreply@blogger.comtag:blogger.com,1999:blog-1592992209402300549.post-73746892924606096882022-05-08T09:50:04.170-04:002022-05-08T09:50:04.170-04:00I don't know if it's relevant to your situ...I don't know if it's relevant to your situation, but when I cut slots from the top with an end mill I always make the slot at least 1.5x the diameter of mill and use two paths alternately, going about 0.030" down in Z at a time. This reduces the "bite" size and leaves more clearance for coolant influx. It seems to work well for me.Malatropehttps://www.blogger.com/profile/12187333180472067677noreply@blogger.comtag:blogger.com,1999:blog-1592992209402300549.post-85571678103893742082022-05-08T09:19:00.401-04:002022-05-08T09:19:00.401-04:00It's a bit of a story.
Ver.1 was cut entirely...It's a bit of a story.<br /><br />Ver.1 was cut entirely with a 1/4" end mill. When I did the rough sizing contour cut, that needed to be 0.220 deep. Slots are always rough to cut just due to the geometry, and getting coolant into the slot is a weak spot in my system. This wasn't quite the full cutter diameter, but close, so I decided to cut it in .031 deep layers. <br /><br /> When I was cutting the second to last pass, some sort of resonance started up shaking the mill's spindle until it suddenly turned off. As in no LEDs, no nothing. Turns out it had shaken a fuse loose in the holder and cut off the AC to the spindle. Once I recovered, I edited the Gcode to cut that pass again and the last one, and used cutting oil instead of my water misting system. No resonances, no bad vibration. <br /><br />For this one, Ver.2, I decided to rough cut the slot with a 3/8EM for two reasons. First, to cut a wider slot so that the second pass with the 1/4" EM had even less tendency to rub. Second because I have a pretty good 3/8 carbide EM that I thought would help keep vibrations down. Instead of the misting, I used cutting oil for the those passes. Not even a hint of a problem. Leaving 1/8" to cut away to make a 1/2" wide slot out of 3/8" wide slot with the 1/4" EM isn't a difficult cut. I did that in three passes, each 0.150 deep. <br /><br />SiGraybeardhttps://www.blogger.com/profile/00280583031339062059noreply@blogger.comtag:blogger.com,1999:blog-1592992209402300549.post-24464148880091697782022-05-08T06:56:41.138-04:002022-05-08T06:56:41.138-04:00As raven said, it does look good.
And it was a hu...As raven said, it does look good. <br />And it was a huge amount of work to get it looking like that. Well done. John in Phillyhttps://www.blogger.com/profile/16196033252818387245noreply@blogger.comtag:blogger.com,1999:blog-1592992209402300549.post-60461915454666078162022-05-08T00:30:48.736-04:002022-05-08T00:30:48.736-04:00Looking good! Going from .025 to .125 for a finish...Looking good! Going from .025 to .125 for a finish pass is a big step up in radial depth of cut.<br />What prompted that choice?ravennoreply@blogger.com