What's new
What's new
By:
Advanced search…

Search results

  1. S

    Is sheet metal fabrication the best process for this product?

    Wire EDM the forming die then?
  2. S

    How to control size of tiny chamfers/edge breaks on internal features such as small drilled holes?

    You can also place a ball bearing on the hole and use a height gauge on it. With some math or CAD to figure out the correct value. You can also set the part face down on a 2d scanner, if the geometry is suitable.
  3. S

    How to control size of tiny chamfers/edge breaks on internal features such as small drilled holes?

    Machine a cone with a shoulder. Use feeler gauges or gauge blocks to measure the distance from the face of the part to the shoulder. Multiply by a constant related to your cone angle and you'll have the opening diameter.
  4. S

    Ride on vs stand up forklift

    We ran a regular sit down forklift in a 40x60 shop. It's tight but not a big deal.
  5. S

    Is sheet metal fabrication the best process for this product?

    How are you guys who suggest using a press brake intending on forming the 180 degree bend in the top left of the side view?
  6. S

    Is sheet metal fabrication the best process for this product?

    Doesn't look like a good press brake job to me. I think you'd need to bottom bend the 180 degree bend on the left since there isn't enough material to use a conventional V die. You'd need a very specific size gooseneck punch you would have to order custom. The large radius tooling is cheap so...
  7. S

    Drilling thousands of small holes in HDPE "poly pipe"

    I've had good luck with stub length sharp point drills (90 degrees maybe?) back when I was drilling holes in thin PVC for a project.
  8. S

    Robotic abrasive blast cleaner

    20 minutes to blast a single part? That's ridiculous. How big are these parts? Just sort out your blast media and send someone into the room with the PPE and have them blast 100 in a day.
  9. S

    How to slowly ramp up RPMs on motor

    I don't think that's really a fair assessment of torque. The jump is near stall, and the stall torque of series wound motors can be pretty substantial. I wouldn't be surprised to see 1-2 foot pounds or more, but that's a gut feeling. Regardless, the threaded holes are fine so long as the mount...
  10. S

    If no neutral wired to machine, can I use Delta source (Phase Perfect)?

    The pass through phases will always accept power backwards. Given only one phase needs to be generated to back feed the single phase supply, it may be not that much more costly to add that to keep the DC voltage down instead of adding a resistor and the associated control circuitry to tame the...
  11. S

    How to slowly ramp up RPMs on motor

    You can use a VFD to soft start a universal motor. The frequency isn't very relevant the torque will be pulsey at low frequency but it totally works fine if you have the parts on hand. I'd just use a contactor and a timer to short a soft start resistor or capacitor after a few seconds. Two...
  12. S

    "Commonly" found items that contain magnesium (metal)?

    Local metal supplier has chunks of it. They're sort of an overpriced direct to consumer metal distributor, but they shear free of charge. No idea if that's a common thing, because it's a very niche market.
  13. S

    If no neutral wired to machine, can I use Delta source (Phase Perfect)?

    Tangentially related but I hate the convention of dumping fault currents through the EGC. That's literally shunting excessively high currents to the chassis of your machine. If the ground has a slightly high resistance connection then your machine becomes very live briefly. Dump fault current...
  14. S

    At whits end with a employee

    That's a waste of time and likely to kill morale with other employees. Being brand new, he probably showed promise in his ability to learn, but stagnated. We've had people just hit a ceiling on the amount of training they could absorb, and we've had to fire them despite them doing their best.
  15. S

    Has anyone tried "Piece Work" to pay employees?

    It's great if you want to double your overhead with people pricing out the piece rate for every product, checking quality control far more, dealing with workers picking and choosing products to make, unhealthy competition, people with hard jobs getting pissed at the people with gravy jobs...
  16. S

    At whits end with a employee

    We fired a slacker manager and it was the best business decision of the year. Everyone is so much happier. Productivity has increased. Just get rid of the useless people. They aren't worth it.
  17. S

    Robotic abrasive blast cleaner

    We go through 50 pounds of fine aluminum oxide per month. Most of it disappears as dust, and a small pile forms in front of the urinal. We used to have to do major maintenance/repairs every week, but now we only do maintenance every three months and major component replacements every year. It...
  18. S

    Robotic abrasive blast cleaner

    Sure, but it's probably worth getting that blast room worth using, robot or not. You aren't going to reteach the robot for every prototype or oddball part.
  19. S

    Robotic abrasive blast cleaner

    I find neoprene to be a plenty durable rubber for blasting, and use it in replacement valves I made for our pressure pot. Do not use silicone. Terrible for paint and powder coat.
  20. S

    Robotic abrasive blast cleaner

    I built a blast room like that. It takes a ton of care in the design of it to make it comfortable and worthwhile to use. It needs excellent ventilation for visibility, the breathing air needs to not be hot (the standard of using the compressor to provide breathing air is incredibly stupid. I use...

ABOUT PRACTICAL MACHINIST

With more than 10.6 million unique visitors over the last year, Practical Machinist is the most visited site for metalworking professionals. Practical Machinist is the easiest way to learn new techniques, get answers quickly and discuss common challenges with your peers. Register for the world’s largest manufacturing technology forum for free today to stay in the know.

Learn more about us.

LATEST INDUSTRY NEWS

STAY CONNECTED

Facebook Instagram YouTube LinkedIn Pinterest Twitter Tiktok

Register Become a forum member. Register today.

Sign Up Sign up for our e-newsletter.

© 2021 Copyright Practicalmachinist.com. All Rights reserved.

Top