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Type: Posts; User: Strostkovy

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    The issue isn't too fast, it's the ridiculous...

    The issue isn't too fast, it's the ridiculous cycle time that 1/2 inch per second creates
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    [QUOTE=bhigdog;3873088]Maybe I'm missing...

    [QUOTE=bhigdog;3873088]Maybe I'm missing something here. But it seems to me making a splitter with a variable speed ram is asking to be hurt. I split about 5 cords a year. I'm guessing my ram moves...
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    It extends rapidly. I've used that trick before...

    It extends rapidly. I've used that trick before but would rather not have a rapid travel and crawl speed and nothing in between
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    I wanted to use a small cylinder and spring to...

    I wanted to use a small cylinder and spring to actuate the swash plate, but couldn't find suitable parts affordably
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    With the pump I can get (15gpm fully stroked at...

    With the pump I can get (15gpm fully stroked at 3600 rpm, 4000 psi max) and a 4" diameter 18" stroke cylinder up to 3000 psi with a 1800 rpm motor will travel at 2.3 ips at 2.5 tons, 1.2 ips at 5...
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    I have run several and from memory 4" per second...

    I have run several and from memory 4" per second seems right. On a 16" ram that's probably a 7 second cycle time. If 2 or 3 is normal though, even easier for me. But 1/2" per second is too slow and I...
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    Setpoints is a neat idea. Add enough hysteresis...

    Setpoints is a neat idea. Add enough hysteresis to prevent oscillation and it would be good to go. The motor will be a regular AC TEFC motor, and the actuator will be either a large spring return...
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    I'm not trying to make it super fast. I'm trying...

    I'm not trying to make it super fast. I'm trying to match the capability of a gas splitter that does something like an 8 second cycle time on a 16" stroke. I just want it to be able to slow as needed...
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    I only have 2 hp available. Either I have a 20...

    I only have 2 hp available. Either I have a 20 ton ram that moves at 1/2" per second all of the time, or I have a 5 ton wedge that moves at 2" per second.

    I really want it to move at 3-4" per...
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    Control loop for hydraulic piston pump

    I would like to make an electric log splitter for my dad for Christmas. I'm choosing electric due to it only seeing occasional use and always being in range of an outlet. However, I don't like how...
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    We are a much larger shop than we used to be. We...

    We are a much larger shop than we used to be. We don't buy from anyone that wouldn't sell to us when we were little.

    Obviously there are minimum quantities for stuff and we get that, but outright...
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    Maybe even worse than OP here, my "hobby" CNC...

    Maybe even worse than OP here, my "hobby" CNC (can't be assed to go to the warehouse every time I want an aluminum part made) project has a built in WD40 reservoir and pump for lubricating the cut,...
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    I just remembered a while ago I bought a cheap...

    I just remembered a while ago I bought a cheap one axis cnc controller. Something like $50. Supposedly it can home and control speed/position of one servo or stepper and has a few inputs and outputs....
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    I too am on PG&E and lost a week, after holiday...

    I too am on PG&E and lost a week, after holiday time off.
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    Weird. We can still get parts for our Adira at...

    Weird. We can still get parts for our Adira at the price listed in the catalog supplied with the machine.

    Interestingly Hurco is still around, and provides support for their very old backgauge...
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    A loop becomes closed when there is feedback....

    A loop becomes closed when there is feedback. Even IR compensation is a form of closed loop control.

    I would argue a limit switch isn't closed loop, as it is merely starting and stopping an open...
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    I haven't run any numbers but it sounds like a...

    I haven't run any numbers but it sounds like a stepper motor and a leadscrew would work fine. You need to control them with a variable speed oscillator, and may need an acceleration ramp.
  18. Totally underrated: Have an office worker help...

    Totally underrated: Have an office worker help you. Where I'm at the CAD/sales people get tired of sitting at the computer and the shop guys get tired of the physical work. I do both normally but...
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    Disconnect any of the safety circuit wires. They...

    Disconnect any of the safety circuit wires. They rely on normally closed contacts so a break in the circuit makes it stop.

    Some slight variation of this on modern machines, but it usually has the...
  20. On a street or in a parking lot?

    On a street or in a parking lot?
  21. I hope I eventually die in such a spectacular way...

    I hope I eventually die in such a spectacular way that there is no body to dispose of.
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    Actually, yeah. Some math I didn't verify the...

    Actually, yeah. Some math I didn't verify the accuracy of seems to indicate a critical speed of 2755 RPM, ignoring any flutes. That's a mere 8600 SFM. That's only 8 times higher than the highest sfm...
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    Unplugged all of the RJ45 cables, blew out the...

    Unplugged all of the RJ45 cables, blew out the sockets, and plugged them back in.

    That machine had intermittent powerup issues for some time, but eventually refused to do anything and didn't...
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    An oversized scroll saw would work great, as...

    An oversized scroll saw would work great, as those can support omnidirectional blades.


    As for a 72" endmill, you'll exceed the critical speed of the shaft, where the centrifugal force of any...
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    Our laser had similarly odd behavior when RJ45...

    Our laser had similarly odd behavior when RJ45 connectors to the servos were making bad connections.
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