Search found 413 matches
- Sun Aug 29, 2010 10:54 pm
- Forum: General Discussion
- Topic: Electrical hookup / motor questions (P&W 3c mill)
- Replies: 4
- Views: 2871
Re: Electrical hookup / motor questions (P&W 3c mill)
How odd, Steve. I just got done wiring up the machine you sold me, with a 3/4 hp three phase motor, and a Teco VFD. At the moment it's driven direct from the motor to the spindle pulley, no countershaft. I'm a bit short on vises (still to be purchased) but the machine cut its first metal in the base...
- Sat Aug 07, 2010 12:16 pm
- Forum: General Discussion
- Topic: hardinge 4 to 1 dividing head
- Replies: 31
- Views: 13936
Re: hardinge 4 to 1 dividing head
The standard hardinge universal dividing head is in fact four to one ratio.
- Sat Aug 07, 2010 12:11 pm
- Forum: General Discussion
- Topic: high pressure air compressor 3500 psi
- Replies: 13
- Views: 11938
Re: high pressure air compressor 3500 psi
If the volume requirements are truly that low, a bank of 1A nitrogen bottles would do the job.
You would need to fill sequentially from the bottles, don't manifold them all together. No
moving parts, no electricity required.....
Jim
You would need to fill sequentially from the bottles, don't manifold them all together. No
moving parts, no electricity required.....
Jim
- Wed Aug 04, 2010 2:46 pm
- Forum: General Discussion
- Topic: Audels Engineers and Mechanics Guide
- Replies: 7
- Views: 4411
Re: Audels Engineers and Mechanics Guide
The audel books are still published. Dollar per dollar I would say they are
among the best technical education out there.
among the best technical education out there.
- Wed Aug 04, 2010 2:44 pm
- Forum: General Discussion
- Topic: Self-Locking Taper vs Non-Self-locking Taper
- Replies: 20
- Views: 21436
Re: Self-Locking Taper vs Non-Self-locking Taper
"-- The joint must transmit bending and axial loads along the rods. -- There may be tension at some times -- There will likely be some vibration" This set of requirements will be fulfilled without any taper joint by the design mentioned by me above. Don't believe me? Build one and see. Tak...
- Tue Aug 03, 2010 8:04 pm
- Forum: General Discussion
- Topic: Self-Locking Taper vs Non-Self-locking Taper
- Replies: 20
- Views: 21436
Re: Self-Locking Taper vs Non-Self-locking Taper
The angle for a self-locking taper depends on the static coefficient of friction for the materials
involved. The guy lautard book gives the derivation I think.
Again a taper plus locking collar over-defines the geometery. It's unnecessary, really.
Jim
involved. The guy lautard book gives the derivation I think.
Again a taper plus locking collar over-defines the geometery. It's unnecessary, really.
Jim
- Tue Aug 03, 2010 3:29 pm
- Forum: The Photo Album
- Topic: Black Gerstner Machinist Chest Leatherette Recover
- Replies: 4
- Views: 7080
Re: Black Gerstner Machinist Chest Leatherette Recover
Amazing. Only trouble is, he won't have time to shoot at all. He'll be
fielding questions from all the other marksmen about where he got that
case, and where they can get one!
Lovely work indeed.
Jim
fielding questions from all the other marksmen about where he got that
case, and where they can get one!
Lovely work indeed.
Jim
- Tue Aug 03, 2010 3:21 pm
- Forum: General Discussion
- Topic: OT - Free Downloadable Vacuum Tube Design Book
- Replies: 43
- Views: 13595
Re: OT - Free Downloadable Vacuum Tube Design Book
One can build a fine one tube regen receiver using a small leaded tube like that, with nothing
more than two 9V batteries for the plate voltage. I think the A battery would be one or
two AAA cells. It absolutely would fit in a cigarette box.
Jim
more than two 9V batteries for the plate voltage. I think the A battery would be one or
two AAA cells. It absolutely would fit in a cigarette box.
Jim
- Tue Aug 03, 2010 3:17 pm
- Forum: General Discussion
- Topic: Self-Locking Taper vs Non-Self-locking Taper
- Replies: 20
- Views: 21436
Re: Self-Locking Taper vs Non-Self-locking Taper
You don't need a tapered connection to achive your goal. Simply bore a hole
in one rod, and step the other to fit inside with 0.001 clearance. Use
a threaded collar to draw them up. You'll need a flange on one part.
Jim
in one rod, and step the other to fit inside with 0.001 clearance. Use
a threaded collar to draw them up. You'll need a flange on one part.
Jim
- Fri Jul 23, 2010 8:35 pm
- Forum: General Discussion
- Topic: OT - Free Downloadable Vacuum Tube Design Book
- Replies: 43
- Views: 13595
Re: OT - Free Downloadable Vacuum Tube Design Book
BTW, one of my first bosses was a man who did radar technology during WW2, then went on to build discrete transistor circuits, and from there to LS logic in the 1980s. He ran the physics electronics shop, and the nuclear department electronics shop, at the university of wisconsin, madison. His stori...
- Fri Jul 23, 2010 8:32 pm
- Forum: General Discussion
- Topic: OT - Free Downloadable Vacuum Tube Design Book
- Replies: 43
- Views: 13595
Re: OT - Free Downloadable Vacuum Tube Design Book
Randy, Kepco still makes high voltage adjustable power supplies, with current and voltage
limiting characteristics. For example, there's one in my lab that does, I think, 1KV at 50 mA.
Voltage or current limited.
Jim
limiting characteristics. For example, there's one in my lab that does, I think, 1KV at 50 mA.
Voltage or current limited.
Jim
- Wed Jul 21, 2010 3:04 pm
- Forum: The Junk Drawer
- Topic: End of an era
- Replies: 14
- Views: 6500
Re: End of an era
"So we are always paying for the people who screw up" So the number of folks who screw up has magically gone from two percent to over ten percent in the past four years? I don't buy that. Look my position is simple. If this is the real problem all you need to do is stop all entitlements, u...