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Charmilles E10-Isopulse P25 sinker EDM basics
Thanks for your advice. One clarification: When you say "positive," is that the electrode or the part?- Borealis
- Post #3
- Forum: EDM Machining
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Charmilles E10-Isopulse P25 sinker EDM basics
We took on a prototyping project involving some small punch-press dies. The female dies are roughly 1/4" across and have some small-radius internal corners. Because this is a short-term project and die-making isn't our bread-and-butter, I bought a mid-80s Charmilles E10. It's in beautiful...- Borealis
- Thread
- Replies: 3
- Forum: EDM Machining
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Punch and die fixturing--best practices
Fair enough, that explains why I can't find examples of adjustable holders. Glad I never got rid of the #3 jig grinder. -
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Punch and die fixturing--best practices
I'm asking about best practices for designing fixtures mounted to the die shoes that 1. have adjustments for positional and angular alignment of the die, and 2. clamp the punch and die in place. -
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Punch and die fixturing--best practices
I've been using a punch press to punch out small discs (~0.25" dia.) out of 0.035"-thick 260 brass. Because they're round, the angular alignment of the punch and die hasn't mattered. Now, though, I need to make some parts about the same size, but with some features where the alignment is... -
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4140 heat treating questions
Received the book yesterday. It's an easy read and by far the most practical and concise book on heat treating I've ever come across. When Bryson gives instructions about tempering, it gets a little scary, though. Things go all caps and he writes, "IT IS CRITICAL THAT TEMPERING TAKES PLACE AS... -
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4140 heat treating questions
If the foil is sort of a hassle, what do you gents think about anti-scaling compounds like this: https://knifemaking.com/products/anti-scale-compound-for-heat-treating or https://usaknifemaker.com/pbc-regular-anti-scale-powder-1lb.html I'm sorta leery of borrowing techniques from the... -
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4140 heat treating questions
Yessir, only aiming for Rc 48-50 on the exterior after tempering. If you use foil, do you quench the part in the foil or does the part need to be taken out beforehand? Thanks for this recommendation. I've seen other people mention the book before but I just ordered a copy. -
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4140 heat treating questions
We have some 4140 parts that we plan to heat treat next week in our electric atmospheric heat-treating oven. These parts are one-offs for internal r&d, so we won't disappoint any customers if we get this wrong on the first try. These parts are roughly 4" diameter and 1.75" thick. The ASM... -
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Riggers in Tucson, AZ
After a week of waiting, C&M is the only company that provided a quote. In this case, the range of their estimate was $1530-1790 to pick up the machine and transport back to their facility. -
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Will a 900 RPM motor make a relatively quiet phase converter?
I just ran frequency analysis on the noise and the two biggest peaks are at ~120 and ~240Hz. There's almost no signal at 60 Hz, oddly. I don't think rotor balance is the problem, or else the fundamental would be half that much.- Borealis
- Post #11
- Forum: Transformers, Phase Converters and VFD
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Will a 900 RPM motor make a relatively quiet phase converter?
Interesting; I have no guidance from intuition on matters of 3-phase power but I know noise increases faster than linear with whatever velocity scale you care to use... Let me ask this while we're at it: Suppose we have a motor wound for a single voltage. How is the design of a 220V 5hp motor...- Borealis
- Post #7
- Forum: Transformers, Phase Converters and VFD
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Will a 900 RPM motor make a relatively quiet phase converter?
I've got a dynamic balancing bench big enough to handle the rotor. Probably a good idea to start with this and see if it makes a difference.- Borealis
- Post #5
- Forum: Transformers, Phase Converters and VFD
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Will a 900 RPM motor make a relatively quiet phase converter?
Good point, rotational energy scales as moment of inertia x angular velocity squared, so the 900 vs 3600 nominal rpms would drop the rotor energy by 16. So if even if the 900 rpm rotor had a moment of inertia were 2x higher, it'd still be down 8x. It probably would need a flywheel.- Borealis
- Post #4
- Forum: Transformers, Phase Converters and VFD
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Will a 900 RPM motor make a relatively quiet phase converter?
I've been running a Kay industries rotary converter in my shop for the last 12 years. It's been bulletproof, but it's noisy as heck and I'm getting good and tired of the whine. New bearings last year didn't change the noise one iota. I'm guessing a slower motor would be a lot quieter if they...- Borealis
- Thread
- Replies: 12
- Forum: Transformers, Phase Converters and VFD
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What tools should I cary on me, while CNC machining?
Find a new old stock C305R starrett 6" scale and you'll never be without a genuine made-in-the-USA coffee stirrer.- Borealis
- Post #32
- Forum: CNC Machining
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Riggers in Tucson, AZ
I reached out to Southwest Industrial Rigging 15 minutes before closing time and nobody was able to take my call. But I also found C&M rigging up in Phoenix. I called them and they said they do jobs down in Tucson every week and claimed their pricing is usually better than SWIR. Hope to have... -
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Riggers in Tucson, AZ
Simple question (maybe for kpotter or anyone else in the area): Who are the go-to machinery riggers in Tucson? We need a machine picked up from a rural residential location, then skidded for LTL shipping. -
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WTB: Universal cylindrical grinder, rolling mill, punch press...
The grinder is for some custom machine-building tasks from O1, A2, and case-hardened 4140. We will be making a number of shafts with stepped diameters but are roughly 2"OD x 18" oal. This is work between centers. There also is ID/OD grinding required on parts roughly 2" oal x 5"OD x 1.5"ID...- Borealis
- Post #3
- Forum: Machinery for Sale or Wanted