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  1. DDRSS10

    Preconditioning Hadfield steel by shotblasting

    Arunmaro, Hadn't thought of it. These parts are prototypes and even in production will be pretty low quantities. NiHard appears to be a casting alloy only, can it be purchased in bar stock and machined? Casting just a few will be really expensive. I have worked with Hadfield in the past, I...
  2. DDRSS10

    Preconditioning Hadfield steel by shotblasting

    I am still in the design phase of two relativly small parts both with a 2 1/2" machined bore. They are part of a concrete pumping system, I am looking to reduce the abrasive wear by preconditioning the surface to 500-600 bhn. I am concerned that the flowing concrete will not create enough...
  3. DDRSS10

    Preconditioning Hadfield steel by shotblasting

    Has anyone had any experience in surface preconditioning of Hadfield steels thru shotblasting?
  4. DDRSS10

    Large Workpiece Machining

    Try plunge milling, I've had some amazing results with that method.
  5. DDRSS10

    Marriage and Work!

    Engineer - Juvinile Probation Officer Yeah, that one lasted 11 months. At some point in my career I need to say no to a project.
  6. DDRSS10

    Slurry Impeller Erosion

    I have worked with centrifugal pumps that were used for pumping taconite slurry, and crushed hard rock overburden slurry, two of the most abrasive things out there. I am not sure of the gpm, but these were 1000-2500hp pumps that would erode a 350-600lb high mn cast steel impeller by 70% in as...
  7. DDRSS10

    Need equipment: "stud adapter" with 5/8"-11 and 1/2"-13 ends

    Have them made at a local machine shop. Nick "Speed costs money boys, how fast do you want to go?"
  8. DDRSS10

    Machinery for working with aluminum and steel angle?

    $10 for machining? That means an average shop would have to do between 5-7 pieces an hour to make shop rate. Thats around 450 holes on location through 1/4" of aluminum an hour. You would really need to haul to even do half of that considering load times, traversing, debur(if you want finished...
  9. DDRSS10

    Where have all the skilled trades gone?

    I am one of the elusive "Talented" young people, and by coincidence am from the "rust belt". I was raised near the mines in northern Minnesota. I got to see the hardship of the 80's first hand and was told that the trades were a dying work place. That was a large factor in my decision to prove...
  10. DDRSS10

    Ceramic coating vs. Polishing

    I had a two stroke gasoline engines piston crowns and heads coated by swain. It is a ragged edge set up that I had problems with burnt pistons in the past. Some pistons only lasted 12-16 hrs. I have reduced the oil consumption by 35% leaned the motor out by 5 jet sizes(about 12%) and the pistons...
  11. DDRSS10

    Will Discipline Help?

    Max, I was in no way implying that 47% was entirely the fault of the customer, or acceptable. We were at about 17%, but all be told it ment alot of long nights for the guys who were up to the challenge. Nick "Speed costs money boys, how fast do you want to go?"
  12. DDRSS10

    Will Discipline Help?

    I have worked in a shop that ran a lot like you described. It was at times frustrating to see other people slacking when I was busting hump. But when it came right down to it the boss saw who was working harder, and made it right with that person. I see some of the comments about having 100% otd...
  13. DDRSS10

    HSK tool holders

    In my opinion a cat50 would be a much better option. From the aplications I've seen the HSK's are more of a high speed holder, at 5000rpm a cat50 is more ecnomical and available. Nick "Speed costs money boys, how fast do you want to go?"
  14. DDRSS10

    Shaft fracturing

    A large part of the non breakage with electric/ breakage on the combustion is the rotating mass of the engine is much higher. The acceleration of the pump at clutch lockup is nearly instant when in service, being that the clutch is driven with a splined shaft. If you were to switch to a belt the...
  15. DDRSS10

    Material for Bearing Driver

    Using annealed S7 would probably work as well. It would work harden on the contact surfaces quite quickly and would be less prone to craking/shattering caused by pressing on hardened steel. Nick "Speed costs money boys, how fast do you want to go?"
  16. DDRSS10

    Bearing wear on Stainless Steel Bar

    The reason for hardening the bar before chrome that chrome is very intolerant of deformation, if the base material was to deform the chrome would flake off. In my opinion the bar should have a small flat area for the bearing to ride,or go with a slider shoe rather than a rolling element. Nick...
  17. DDRSS10

    Process for cutting welded pipe/cross headers in half?

    You can get kerfs in the .06-.09 range with a band saw. any shop with a good saw can pound out these cuts with good precision. I would consider this about the only cost effective method. Nick
  18. DDRSS10

    PULL OUT FORCE ON 10-32 THREAD IN ALUMINUM

    Have you thought of using helicoils or threaded inserts to increase the pullout strength of the holes. Just a thought. Nick "Speed costs money boys, how fast do you want to go?"
  19. DDRSS10

    Residual Stress - Heat treatment of 316L

    Mildjoe, Speeds and feeds are very part, machine, part, cutter, insert, ect specific. There are a million variables that go into them. The best thing you could do is talk with one of the older experienced machinists on the job, someone who can look at the print and you can explain what...
  20. DDRSS10

    Residual Stress - Heat treatment of 316L

    SS In my experience has a ton of internal stress. I have machined a lot of it and any time I've removed more matl from one side than the other I've found warpage. It can be very trying with asymetrical parts. What I've found is best to do is rough machine all large features then go back and...

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