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  1. Finegrain

    How fast (SFM) can you run HSS in 6061?

    I'm running a Whitney 5/32" bullnose cutter in 6061 to put a bullnose all the way around a ~5" x 20" part. I actually don't know what the practical limits are for HSS cutting 6061. I'm running 1,300 SFM right now, and all seems well. I'd like to go faster, of course, but I don't want to...
  2. Finegrain

    Need source for "better" 3/16" 6061 plate

    Hello, I make a family of parts from 3/16" 6061 plate. Parts finish to nominal thickness, ~8" wide, between 14 and 20" long. They get a bunch of pockets and holes put in. Flatness +/-.01", thickness +/-.005". I've been trying to use commodity 3/16" 6061 plate, but much of the time, what I get...
  3. Finegrain

    What are the actual tolerances for a "Min" or "Max" dimension callout?

    I am working on this part, which has the following tolerance callouts: The blanket 1-decimal tolerance is +/-0.25mm and the 2-decimal tolerance is +/-.08mm. So, is the 22.6MAX supposed to be 22.6 +0/-.25, and the 12.53MIN supposed to 12.53 +.08/-0? Or could the space between the ears be, for...
  4. Finegrain

    2 issues with latest SW upgrade

    1. There used to be a "Daily Posts" in addition to "New Posts". It seems to be gone now. "New Posts" a PITA, IMO, since you can't re-read a post. Once you read it, it is no longer "New" and so it doesn't show up in the "New Posts" list. 2. No static URL for "New Posts" that I can save in my...
  5. Finegrain

    30-taper guys - what drill to make 100's of 17mm holes 65mm deep?

    Hi guys, I'm looking for a drill to make a few hundred 17mm holes, 65mm deep, in 6061. ID tolerance +/-.25mm. 30-taper machine (Brother Speedio S700X1 16k RPM spindle) so torque is a concern. Thanks, and regards. Mike
  6. Finegrain

    Looking for a lathe tool to cut 60* dovetail jaws

    Hello, I'm looking for a tool to make 60* dovetail jaws for the lathe. I make extensive use of dovetail jaws on the mill, with an AB Tools Dexi Dovetail 60* indexable cutter. This is what I'll use to dovetail the stock, but am needing a lathe tool to machine the corresponding 60* dovetail in...
  7. Finegrain

    Looking for many-flute Al finisher

    Hello, I'm quoting a 6061 job that would really benefit from a many-flute 1/2" finisher. Big sweeping contours, only 1/4" thick. I'll rough with a separate tool to within .02"-ish, so the finisher doesn't need to take much off. Seems like everything that is billed as "For Aluminum" is 3-flute...
  8. Finegrain

    What drill size do you use for form tapping M8?

    Hi guys, I'm looking at my tooling for M8 (standard 1.25mm pitch) form tapping, and am having some trouble deciding what drill to use. The form tap drill size chart I use says that a 65% thread needs a 7.45mm drill. That's hard-to-find metric size, and is right in between L and M letter drills...
  9. Finegrain

    Where to order Class X pin gages and get them quickly?

    Hello, I used to be able to order Class X pin gages from MSC and get them next day if in stock, or at least direct-shipped from Vermont. Apparently they made some "improvements" to their website and I can no longer type in the pin size I want. I have to pick from a selector, but the selector is...
  10. Finegrain

    Mori- Seiki SL-2B Z-axis limit switch -- where is it?

    Hello, I overtraveled my Mori Seiki SL-2B which is usually not a big deal, just jog off of the switch and clear the alarm. But today I'm unable to clear the alarm even after moving the Z-axis way off of the switch. I fear the limit switch might be stuck. Anybody know where the switch is...
  11. Finegrain

    Why do my cermet boring head inserts break down so quickly?

    1018 steel 1" thick .7504" thru bore Rough it out to .748" with an endmill Brother Speedio S700X1 Stanny micron boring head 16mm x 60mm bar TPGH09020L TN60 insert (Kyocera cermet) 2,000 RPM .0015 IPR Flood coolant I get good results for 4 or 5 parts, then I have to start bringing the cutter...
  12. Finegrain

    Deburring steeply sloped cross holes

    I need to deburr/chamfer a 6mm bore, ~40mm deep, intersecting 2x .386" cross holes. I looked at EZBurr, BurrAway, and Heule COFA. The Heule COFA seems well-suited to steeply sloping surfaces, while the EZBurr and BurrAway are more for flat or slightly sloping surfaces. Material is mild steel...
  13. Finegrain

    Any newer players in the 9-11" horizontal bandsaw field?

    Hello, I'm looking at replacing a 7x12 horizontal with something more capable. There is a nice spot in my small shop that the current saw sits in, that a somewhat larger saw could also be in, but not an infeed table, so it can't be an automatic. This will likely be an EOL purchase so something...
  14. Finegrain

    Looking for antique Clausing lathe POC -- giving away Clausing metric kit parts

    Hello, I used to make metric threading kits for Clausing 5900 series lathes. I found a bunch of parts for these kits in my storage area. Gears, bushings, brackets. etc.. I'm not interested in trying to sell these piecemeal, but it would be a shame to chuck them all in the scrap bin. Does...
  15. Finegrain

    Plunge cutting boring bar (Oopsie!!)

    Question: How far can a 1-1/4" boring bar make it into a 3" OD 6061 blank that doesn't have a drilled hole? Answer: Surprisingly far! These blanks have a 1.69" hole drilled in one end, and the boring bar is supposed to finish the bore to 1.753". Get distracted, put the blank in the wrong...
  16. Finegrain

    Speedio guys -- how big is a "pulse" in the context of setting backlash comp?

    Speedio guys -- how big is a "pulse" in the context of setting backlash comp? I'm configuring backlash comp on my 2016 Speedio S700X1. The unit for this parameter is "pulse". I have not found a definition for "pulse". It seems to be a very small unit, as I am seeing values of ~100 correspond to...
  17. Finegrain

    New Xometry requirement to purchased material from Xometry?

    Hi guys that are looking at Xometry jobs, I've started to see this called out on some job offers: "By accepting this job, you agree to purchase material through Xometry Supplies, material quote attached. A link to a live shopping cart will be emailed upon job acceptance and material will have...
  18. Finegrain

    What SExx inserts for steel, for use in a 30-taper?

    Hi guys, I don't do much steel in my Speedio, but when I do, facing is dicey. I take very light finishing cuts, but the blunt inserts I have been using cut "hard". Like, they pound, or something like that. Anybody got a recommendation for a softer-cutting steel SExx 45* face mill insert...
  19. Finegrain

    Turning "hard" pure copper -- sharp Al-style or blunt steel-style inserts?

    Hi guys, I need to turn some pure copper tube. It is described as "tempered hard". No fancy turning, just trimming part of the 7/8" OD to .855", chamfering the ends, and cutting off. I have very sharp Korloy uncoated inserts, and standard TiAlN coated steel/stainless steel inserts. Which...
  20. Finegrain

    Who to use for sporadic credit card payments?

    Hi guys, I have gotten away with not needing a merchant account for some years, but I now have a potential customer that insists on paying with a credit card. So far all I see are merchant account services that have minimum monthly usage requirements and monthly fees. Last time I went down this...
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