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  1. sfriedberg

    Video of large planer mill with pushbrooms on fire

    Several times in the past I have watched a video of a large planer mill (almost certainly an Ingersoll-Rand) facing off the top of a very large slab. (I can't recall if this machine had multiple heads in operation.) The cutters were making chips that probably weighed 0.5 to 2 lbs, and there...
  2. sfriedberg

    Will a Hi-Roc drill survive this situation?

    Sorry I don't have a photo to show. I just ran across a hard-as-hell inclusion in a 1.75" square bar of CF 1018. Was using a HSS 1/8" wide plain milling cutter (slotting saw) to make some .203" wide, 0.156" deep grooves. Using quite conservative SFM, feeds and DOC, total of 6 passes. Did one...
  3. sfriedberg

    How to turn/grind between centers with deliberate small eccentricity?

    There's another thread active about turning eccentric (1/8") long (8') shafts on a manual lathe. I've got a smaller scale problem where I'd like to ask for advice. I plan to teach some highschoolers some rudiments of precision measurement, and part of that is testing for taper and TIR, with...
  4. sfriedberg

    Q: Technique or tool for spreading blue on a dovetail

    I've been working over the Y axis of an unmentionable, got the load-bearing bed ways and saddle ways planar, and used a dovetail straightedge to clean up the non-gib dovetail of the saddle. I now want to blue up that saddle dovetail to transfer to the mating bed dovetail in order to...
  5. sfriedberg

    Thinning thick Canode?

    I have three bottles of Canode I got a few years ago, and they have done that funny thing where the plastic bottles have sucked inward (as if there's a vacuum inside, but there is no actual negative pressure) and the contents have gotten a bit thick. I found the 2014 thread here about...
  6. sfriedberg

    Wanted: Narrow thin stainless strip or shim

    This is a bit of a long shot, but if anybody has narrow stainless shim, or thin sheet shear drops or maybe a specialty metal tape of some kind, anywhere from 0.1-0.25" wide (1/8" would be great), 0.002-0.010" thick (0.005" would be great), 4" or longer useable lengths, I'm interested in getting...
  7. sfriedberg

    Group buy of 4 arc-second (0.02mm/m) level vials

    After procrastinating for a couple of years, I am finally organizing a group buy of ground spirit level vials. I'm looking specifically at Level Development's 5726/101 model, with a sensitivity of 4 arc-second (0.02mm/m) per division. As you can see from the link, these are raw vials without a...
  8. sfriedberg

    Sources for semi-custom HSS slitting saws?

    I have a job coming up where I need a 4" diameter saw, 0.035-0.036" wide, to cut a notch 1" deep in the edge of 0.5" thick 1018. At the moment, I'm looking at 72 teeth and alternate tooth chamfer. Because my feed control for this operation is less than ideal, I'm looking for HSS rather than...
  9. sfriedberg

    Thread cutting tool did a lot of thread forming

    I usually cut threads with die heads or taps, and do relatively little conventional thread cutting on the manual lathe. Over the holiday I needed to cut some simple 1/2" long 3/8-16NC threads on some 1/2" 1018 rod, and had a very strange experience that I probably should have had during an...
  10. sfriedberg

    Cyanoacrylate (super-glue) fixturing?

    We've got a one-off job coming up where we need to reduce the thickness of some stock 0.125" 6061 sheet to 0.098" and also cut some 0.050" to 0.070" slots the majority of the length of the part. My intention is to face off a sacrificial block held in the vise, then super-glue the sheet to the...
  11. sfriedberg

    Safe to dress wheel heavily clogged with aluminum?

    I've recently started helping out a high school robotics team, and came across a really revolting situation with their 7" bench grinder today. Despite clear labels "DO NOT GRIND ALUMINUM" on both windows/guards, some clueless student spent a long time smearing globs of aluminum into both...
  12. sfriedberg

    Admin: Reconditioning/scraping subforum not responding

    OK, here's a bizarro problem for the forum IT guys. For the last six hours (give or take), threads and posts under the Machine Reconditioning, Scraping and Inspection subforum have not been served to my client. I've tried following the main forum link to the overall subforum, and...
  13. sfriedberg

    Surface prep 4" OD aluminum rings for anodize

    I've got a small number of parts that won't fit in my vibratory tumbler which need surface prep before I send them out for anodize. All are rings cut from 4"OD X 0.125"wall 6061T6 aluminum tube, 4x 3/4" long, 1x 1-15/16" long, 1x 2-1/16" long. Just looking for the typical "galvanized...
  14. sfriedberg

    Somewhat OT - Questions about durable color selective coating

    Question: What would you recommend for a very durable, selective coating with a distinct color contrast to the base material? Let's assume our parts are roughly the size of a nut to fit a 3/8 or 1/2" machine screw. The natural material choice is steel, but aluminum is possible. Brass is also...
  15. sfriedberg

    OT: Some metalwork at the Maryhill Museum

    I've lived a couple hours away from the Maryhill Museum for about 25 years, but never took the time to go look at it. The history of the place involves a pretty wacky bunch of characters, including Queen Marie of Romania and an exotic dancer (no, not a stripper) and Sam Hill, a road-building...
  16. sfriedberg

    Any opinions on ErgoSafe's new cylinder lift?

    I'm about to get an oxy-propane cutting rig, and will be using 200cf or 300cf oxygen cylinders. My local welding gas outfit does exchanges at a dock sized for large trucks. I've been able to man-handle my 125cf or 150cf cylinders up and down from the dock, but as I get older the idea of...
  17. sfriedberg

    Very OT - MolyD microchip technology

    With all the fan-mail here for MolyD (molybdenum disulfide, MoS2) as a lube or tapping fluid, I thought I could get away with mentioning a very early technology experiment where a small, but quite functional, microcomputer chip with 115 transistors was made of MoS2. Article here. We normally...
  18. sfriedberg

    Known issues for Mitutoyo HDS Digimatic height gages?

    I'm considering the purchase of an 18" height gage. I am very familiar with the Mitutoyo mechanical dial style (models 192-15x) and its many competent clones. Looks like Mitutoyo has two alternate lines, standard Digimatic (models 192-63x-10) and HDS Digimatic (models 570-31x). The standard...
  19. sfriedberg

    An illustration of why chatter can be hard to stop

    While hunting for something quite different, I ran across an academic paper studying chatter. In particular, looking at the feed/speed regions where chatter is pretty much assured and where it could go either way, depending on initial conditions (i.e., how stern you look at the cutter when it...
  20. sfriedberg

    WTB 1/4" collet Hardinge 50V aka Van Norman "2"

    As the title says, I'd like to buy a 1/4" Van Norman "2" collet (probably more widely known as Hardinge 50V collets). If you've got an unwanted one, please send me an email (PM box probably will be full) with a photo to show collet condition and your asking price.

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