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  1. R

    Aluminum Piston Material sources?

    Hardness test. Also, model aircraft pistons don't need to be nearly as strong as the full scale, due to the scaling factor. 6061 will never come unglued at that scale, but 2024 is dandy, and over kill, if you have some. 7075 is strong stuff, but has corrosion issues, that are likely to show up...
  2. R

    Parallel Keepers

    As not to stray the other idea thread into a hijacked how to... I am getting EM's and PM's for details on "How do they work", "I don't get it", "I want to make a smaller version" topics. Here is the dealio. Sometimes I go 180 degrees from mainstream thought. (You''ll learn not to be surprised...
  3. R

    4 inch Milling Vise

    Agreed to all. My .02. ...If you need swivel, go with a rotary table. You can clamp the small vice onto it, or use other means of clamping the parts to it. But, then you can do everything with it. Mill grooves, space slots, make wheel cutouts, etc. ....And you can swivel it. And the swivel...
  4. R

    Anyone here add a DRO to a Bridgport?

    I've had no complaints with the 3 axis Grizzly. Good bang for the buck. As stated by others, circle pattern features, and the like, get used here all the time too. The halving feature for finding center, and having an on board calculator, earn their keep too. I'm with the "all 3 axis"...
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    Using thin parallels

    :big: Seeeeee. They are "Sissy tools". lmao. Make no mistake. Macguyver has nothing on me, and I am the king of thrift, and love the innovative how to's. There is of course a difference between mills being used for a hobby and one that is being used for production, and production tooling...
  6. R

    Using thin parallels

    OK, I hope you guys are up for a little razzing today....! :big: Every hobby/career/venue has a few things quirks that drive a guy crazy. lol. Being into model airplanes, I find people will spend 30 hours, and 4 times as much money, making something, or will use something totally inferior and...
  7. R

    Tool Post Grinder. Dovetail Version.

    Actually, the 2 motors I bought, were from Axman. I've been there twice recently. But the two I bought were quiet, and smooth, but I grabbed the bare spindles and pinched them between my fingers, and instead of burning them, I was able to stop the shafts easily. My die grinder at 11,000 rpm...
  8. R

    Tool Post Grinder. Dovetail Version.

    Thanks Stew. Your insights have helped a lot here! I did look at my router with dismantling eyes, and then promptly gave it a reprieve of sentence, when I saw the 30,000 RPM's listed. I also looked at my Roto-Zip, and then offered it the same clemency, for the same reason. My son produced a...
  9. R

    Tool Post Grinder. Dovetail Version.

    Well, after doing some research and viewing others handiwork here, I decided to build my own version of a tool post grinder. Parameters: Design parameters are everything IMO. Everyone has different skill levels, different machinery, different budgets, and different purposes to suit. With...
  10. R

    What type of chuck should I get??

    As everyone is saying here, you have to start with the set up of the machine. There are many things to do for a properly set up machine. Many times the manufacture will actually supply an outline for doing this in the owners manual, or online in their owners manuals. Leveling the machine, and...
  11. R

    What type of chuck should I get??

    I would suggest setting up the machine correctly before you buy anything. Getting taper out, and all that good stuff. Then make a ring, and turn the jaws true. (someone here can outline that procedure, or I will later, if need be.) If it's a repeatability issue, that will show up once you true...
  12. R

    Tool Post Grinder

    Excellent! Thanks! The gears are turning. My current project really needs a tool post grinder. Fortunately, it's not a one lane road on this build, with lots of side streets to keep busy on, but eventually I need to go there. I don't see any flats for removal tools. Not needed? And lastly...
  13. R

    Tool Post Grinder

    Some really cool stuff here. But, I'm still not picking up how your are arboring all this stuff up. The last pic, for example, you have wheels, and cups, and the pin vices, and the wheels are on individual arbors, but I'm not seeing any tapers, or draw bars, or collets to suck them in, nor can...
  14. R

    Electric "Engine" Build

    Wait til my son see this.... You'll have a new best friend. .... 8)
  15. R

    Lost part

    lmao..... :big: OK, last night I was thinking about just such a topic. I was making some dimple dies for my jet engine burner cans, to go into my rivet squeezer. 1/2 inch stainless, about 7/8 inches long total. I started parting it off, and I was soooo pleased that my 9 x 20 lathe was parting...
  16. R

    Project Steam Plant

    We like it! :bow:
  17. R

    what oil do you use?

    As stated above, ...ISO is the International Organization for Standardization, SAE is the Society of Automotive Engineers. As pointed out, you can cross the numbers, and the simple version is that; the bigger the number, the thicker the oil with ISO, and SAE both. But the scales are different...
  18. R

    fire eater won't run

    1 Friction has to be very very low. It should go around quite a few times with a hard flip. But you should not need a hard flip to get it going. 2. No oil at all in the cylinder. Zero. Not even spray off the connecting rod. Even the condensation of water on the valve while it warms up will...
  19. R

    what oil do you use?

    Now that I am repairing CNC's for a living, (I fixed big jets for a long time) I pretty much know what goes in all of them, Vactra #2 for slideways or 68 waylube, etc, and gobs of other lubes for everything else, all the way up to ISO 100 and 150 for some of the bar feeders, which is all good...
  20. R

    Tool Post Grinder

    Sweet!, You are reading my mind. I've been searching for tool post grinders here, and did not find much yet. I have been gathering parts and ideas for a few weeks now, and ideas for a lot longer. I think I am headed more in the direction of attaching it to the dovetail tool holder. Possibly...
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