Search Results - Practical Machinist - Largest Manufacturing Technology Forum on the Web
Close
Login to Your Account

Search:

Type: Posts; User: rjs44032

Page 1 of 30 1 2 3 4

Search: Search took 0.01 seconds.

  1. Replies
    317
    Views
    16,697

    Oh brother... Here we go again. I think this...

    Oh brother... Here we go again.

    I think this has been beaten to death enough. I do not need a special forum to feel special. I've always considered myself and other Diamond Toolmakers Toolmakers....
  2. Replies
    37
    Views
    2,125

    Agreed, I only had small number to do. So...

    Agreed, I only had small number to do. So couldn't justify special fixture. And I still agree that centering with pin (or pins) is best course.

    Best Regards,
    Bob
  3. Replies
    37
    Views
    2,125

    I don't know why the conclusion that you need to...

    I don't know why the conclusion that you need to chuck the gear up on pins. I would never do that. When I did my 16-DP gears, I used brass shims on the 4 jaws and 1 pin to center the pitch circle....
  4. Replies
    37
    Views
    2,125

    I agree with this, providing the bore is...

    I agree with this, providing the bore is accessible and not damaged. Considering this was obvious, I assumed there was some reason that the bore could not be used to center the work.

    Best...
  5. Replies
    37
    Views
    2,125

    +1 Formula for calculating correct wire/pin...

    +1

    Formula for calculating correct wire/pin size for given spur gear DP is available in Machinery's Handbook. Look for 'Checking Gear Size Measurement over Wires or Pins' I used this method to...
  6. Thread: Step Drills?

    by rjs44032
    Replies
    25
    Views
    1,920

    When you search for step drills you get the...

    When you search for step drills you get the 'Tree' kind, even at MSC or McMaster. The single step drills are called 'Subland Drills', at least in my quick search.

    Best Regards,
    Bob
  7. Thread: Step Drills?

    by rjs44032
    Replies
    25
    Views
    1,920

    I recently discovered step-drills with a lot of...

    I recently discovered step-drills with a lot of tools I purchased. I tried them on a job where I was drilling 3/8" holes by hand. Wow what a difference it made in both ease of drilling and time it...
  8. Replies
    12
    Views
    604

    Here is link to the sticky: posted as far back as...

    Here is link to the sticky: posted as far back as 2007
    Machinery Discussion Guidelines

    Best Regards,
    Bob
  9. Replies
    19
    Views
    1,126

    This is the one I have:...

    This is the one I have: https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/micro/gs1-21p0

    It powers my 1hp 3ph inverter duty motor...
  10. Replies
    19
    Views
    1,126

    Agree on the oil-coolant protection. I designed...

    Agree on the oil-coolant protection. I designed my panel to be angled away from the chip pan. Easy access but little chance of contamination.

    I used premium microphone cable for all connections....
  11. Replies
    19
    Views
    1,126

    I did not use High-volt switches. These...

    I did not use High-volt switches. These components come from the music industry (one of my prior pursuits). They are durable but designed for low voltage applications.


    Best Regards,
    Bob
  12. Replies
    19
    Views
    1,126

    I am using aftermarket switches: 1 Push On /...

    I am using aftermarket switches:

    1 Push On / Push Off for Start / Stop. This is a heavy duty switch. It came out of a foot-switch.

    1 momentary contact switch normally-open for jog.

    1 pot for...
  13. Replies
    19
    Views
    1,126

    I am not an expert, but my understanding is that...

    I am not an expert, but my understanding is that most of these VFDs up to 3HP are already de-rated. So nameplate spec does not have to be doubled for your application. I am running a 1HP Automation...
  14. +1 on what Peter said. Need gage-line diameter. ...

    +1 on what Peter said. Need gage-line diameter.

    Best Regards,
    Bob
  15. Replies
    145
    Views
    9,090

    I'll take 12. Paypal sent. Best Regards, Bob

    I'll take 12. Paypal sent.

    Best Regards,
    Bob
  16. Wow! Over 300 posts now to answer the OPs...

    Wow!

    Over 300 posts now to answer the OPs question. Well you are wrong. How does the inch have higher resolution?

    127mm = 5" or

    25.4mm = 1"

    3 significant digits for MMs :rolleyes5:
  17. 0.00002" of one or 0.5 micron of another. What's...

    0.00002" of one or 0.5 micron of another. What's the difference?

    I use whatever system is most appropriate for the task at hand.

    Best Regards,
    Bob
  18. Replies
    7
    Views
    686

    Ok 1100 RPM on 7/8" cutter is 250 ft/min. Rule of...

    Ok 1100 RPM on 7/8" cutter is 250 ft/min. Rule of thumb speed for leadloy should be no more than 150 ft/min for HSS. I would start at 400 RPM and go up from there. Typically chatter on solid setup is...
  19. Replies
    77
    Views
    4,043

    Not here. I've been looking for supplies of 91%...

    Not here. I've been looking for supplies of 91% isopropyl alchohol (not hand sanitizer). Used to buy it everywhere by the quart for $2. Now it's never stocked. Still Can't get it online either....
  20. Replies
    77
    Views
    4,043

    Once was a time when a spit hand-shake was...

    Once was a time when a spit hand-shake was acceptable. In certain circles the hand-shake is still alive. Hope we get back to normal soon.

    Best Regards,

    Bob
  21. Replies
    76
    Views
    23,460

    Steve, Welcome to the forum! As I posted...

    Steve,

    Welcome to the forum! As I posted several years ago, I used Coborn diamond cutting machines for many years during my career. I found them to be the finest diamond cutting machines on the...
  22. Replies
    17
    Views
    907

    Wjw159, Edit: Missed your previous post. Glad...

    Wjw159,

    Edit: Missed your previous post. Glad you were successful.

    Best Regards,
    Bob
  23. Replies
    17
    Views
    907

    Wjw159 when you get back into it, check out the...

    Wjw159 when you get back into it, check out the link in Ben's post above. In that case, a spacer and gear was flipped inside the QCGB. Sounds like similar problem.

    Ben, thanks for posting that...
  24. Replies
    17
    Views
    907

    Yes. If your lead-screw is 8 tpi, the gear box...

    Yes. If your lead-screw is 8 tpi, the gear box should turn 1:1 when it's set for 8 TPI. This assumes no sheared keys in the gear train.

    If you've established that then the problem has to be in the...
  25. Replies
    17
    Views
    907

    If you're set up for 8TPI, then that should...

    If you're set up for 8TPI, then that should eliminate the QCGB from the equation. You just need to verify that the QCGB is producing a 1:1 ratio. You don't need to check the internals unless it isn't...
Results 1 to 25 of 741
Page 1 of 30 1 2 3 4