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  1. ninefinger

    Aero Engine

    Hi John, The cylinders (Drawing J18) were never available as a casting to my knowledge. There was someone offering them machined on CNC but I never investigated to far as I was rather short on money back then (more than 10 years ago). The cylinders can be machined but are a finicky...
  2. ninefinger

    Aero Engine

    FYI - the castings were originally made by Vernal Engineering ( Bruce Satra ). Not sure who has the dies now but they are very fine castings. I must say that the engine is not for beginners, myself being one who has been picking away at this engine for over 10 years (but very infrequently).
  3. ninefinger

    retiring to machinist

    As I said, they claim made in Canada, so there is an expectation that its more than purchasing a ready to go product from overseas and putting it in a new cardboard box, which is what the Everlast and other inexpensive welders are (and they don't claim to be anything other than that). I also...
  4. ninefinger

    retiring to machinist

    My humble opinion is that for hobby type work the shorter length will likely never be an issue, unless you are trying to abuse your lathe and use it for wood turning. I've been TIG welder shopping and am seriously considering the Canaweld TIG AC/DC pulse 201-D over the Everlast - at least it...
  5. ninefinger

    Any suggested gear cutting sets?

    The metric module cutters are significantly cheaper than the DP cutters of similar tooth size, so much so that I'm converting the drawings for the radial engine I'm building. This is mostly due to being available from China ( as opposed to being from say US / Germany / Poland / Taiwan etc. )...
  6. ninefinger

    Lathes

    With respect to "safer", even a mini lathe can hurt you if not paying attention or careless. Hair tied up, no loose clothing etc. Use safe work practice no matter the size. Respect the machine, it doesn't know or care if its cutting metal or you. I would expect the 707 from Busybee will...
  7. ninefinger

    Lathes

    You won't be crossing the border for shopping any time soon, and it won't be economical (must pay for covid test, quarantine required on return even if you just set foot across the border for 1 second)... Living in Ottawa, I know. As far as a lathe goes, I have a basically new 7x14 sitting...
  8. ninefinger

    O-ring for piston ring

    I've seen alot of discussion on o-rings for pistons, but usually the discussion is around "slow running" engines - hit'n'miss types. What are peoples experiences with faster running engines? My thoughts are to try o-rings on my 9 cylinder build by making a set of custom pistoms for it, but its...
  9. ninefinger

    Engine Valves

    Have you taken into consideration the volume that the intake and exhaust passages have before the spool valves? With your design you have a lot more volume in your combustion chamber/valve passages so you are going to have a relatively low compression ratio. Not sure if you can accommodate and...
  10. ninefinger

    Fusion 360/Linuxcnc computers

    My recommendation for running LinuxCNC is to look into the MESA ethernet cards, like the 7i76e. You pay for the card but the software is free. Its controlled over ethernet and the PC latency doesn't matter nearly as much as the step timing is all done a the card, not the PC. And Fusion 360 -...
  11. ninefinger

    1/6 P&W R-985 Wasp Jr by Bob Roach / Vernal Engineering

    This thread got dragged up from the depths and I figure as the originator I should say I'm still around and progressing at speeds that make tectonic motion look fast.... That said I did more in the last 4 months than I had done in the previous 8 years (lots of excuses). I'll need to switch PC's...
  12. ninefinger

    Software in the cloud

    Trust me Microsoft and other big companies are no better - my 2 year old printer won't work with my pc on Windows 10 but works on my wifes pc with the same operating system - no obvious reason. There is always an example of somebody who got screwed by Linux or Windows. I could list dozens of...
  13. ninefinger

    Help cutting thin cooling fins

    Rich, No credit to me on the heads, those are castings from Bruce Satra (vernal engineering). No idea if they are still available. I can't imagine making them other than casting. Bob, Milling does a couple of things that are beneficial in this case (to me and my amateur efforts in the shop)...
  14. ninefinger

    Help cutting thin cooling fins

    Wow - almost 8 years! Being the originator of this thread I'm going to be the one to bring it back from the grave. I finally succeeded in cutting the fins on all 9 cylinders in a repeatable, controlled manner that has a nice looking final product. Here is the recipe I finally used...
  15. ninefinger

    How to use a Conical Edge Finder

    This assumes that you have not clamped the part and / or vise to the machine table - which can be a very dangerous way to operate, especially with larger drills. I strongly disagree with this and would not recommend it to anybody.
  16. ninefinger

    Outlet for model engines

    I would beg to differ - CNC does not just spit out precise parts, lathe or mill. It takes skill to setup a CNC machine just as much as operating a manual one, maybe more so in order to get it to dance just right. And with hobby stuff being many times just one offs there is little to be gained...
  17. ninefinger

    Help regarding internal gear

    I created a log in for the KHK and it does generate dxf outputs for taking into your cad program. As can be seen the internal gear tooth profile gets modified at the root and the ID is smaller as well, the left side was the original gear as drawn by the add-in to Fusion 360, and the right side...
  18. ninefinger

    Model Pratt & Whitney Radial Engine

    I've been struggling with making these cylinders off and on (mostly off) for what appears to be 8 years! I have actually made real good progress only recently, as the major stumbling block has been the cutting of the fins. I believe I've finally figured that part out but I'm in no place to...
  19. ninefinger

    Help regarding internal gear

    Using software you can determine the shape of the cutter. I used a free add-in for Fusion 360 from FM Gears that lets you draw very easily an internal (or external) gear. You could then model your cutter from the resulting gear. If you don't have Fusion 360 the same author of the add in offers...
  20. ninefinger

    Servo Drive For a lathe Compound

    You can skip the arduino if all you want to do is drive the stepper forward or backward at a fixed or variable speed. https://www.amazon.com/dp/B077SFDMFJ/?tag=skimlinks_replacement-20 Its a stepper pulse and direction generator. The link is amazon but available from many sources. Mike
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