Here is a list of all the postings blowlamp has made in our forums. Click on a thread name to jump to the thread.
|Thread: Why does everyone disagree with you|
I don't think so.
Yes. That was about a guy that painted his face with lemon juice and went to rob a bank thinking the lemon juice would make him invisible.
He believed that because lemon juice was is used in invisible ink.
When arrested and shown photos of himself committing the robbery, he insisted the photos had been faked.
Seems like a little bit of knowledge is a dangerous thing.
|Thread: Learning CAD with Alibre Atom3D|
If you want, I could try running those stl files through MoI for you, to get them into something you could play with.
|Thread: Cast Iron Watch Case|
I don't know which grade of bronze they use for the case, but I think stainless steel, titanium or sapphire casebacks are normally fitted to minimise skin contact
Bronze would be OK and is already used by some makers if you're looking for a change from stainless steel.
|Thread: Adhesive to bond metal to glass|
About 50 seconds into this video seems to be a similar application to yours.
Product info link here.
|Thread: What to use on my Sherline mill to round off pinion wire leafs|
I think pinion wire is quite often filed/abraded and then polished to final form.
|Thread: Possible causing my work being snatched out whilst cutting|
You were holding the part by the pinion leaves in a three jaw chuck?
|Thread: a good quality milling vise for sale|
I was editing my post down a little as you were replying.
It looks like a bit like vice that's had a paint job done on it to me.
Is that wear on the ground horizontal area?
Edited By blowlamp on 09/12/2019 17:08:03
|Thread: ML1 Worn Saddle adjustment|
That does sound like bed wear to me.
Regrinding the bed could be problematic, but you might be able to find someone with a decent sized vertical mill that would be prepared to give a lick to the worn surfaces and get you back with a usable machine again. It's what I would do.
|Thread: Electronic Lead Screw Project|
Michael, the motors have a 1000 line encoder fitted at the rear of the motor and are connected back to the driver in a quadrature configuration, thus giving 4000 pulses per turn of the motor. The closed loop circuit can electronically work up to and maintain position of that 4000 figure.
Many of these drives allow micro-steps into the 40000+ steps per rev region, but I would imagine this more of a marketing feature than of any real world value.
Skip to the 7 minute mark to see the 'wrench test'.
Edited By blowlamp on 07/12/2019 15:02:39
For almost all applications (99% I would think) they are ready to go. My understanding is that the driver constantly monitors & updates its output 'on the fly' to best suit the current operating conditions - I believe that is why they are based around a very powerful processing chip.
Having converted my Denford Starturn 8 CNC lathe from NEMA 34 to a 24 sized closed loop stepper system, there is no way that I would go back to a conventional stepper setup.
I find many improvements, such as faster top speed, the system is far smoother with virtually no mid-band vibration and has better acceleration & deceleration, which is vital if your lathe varies its speed when a heavy cut is applied or removed. Also, if steps are missed such that the closed loop can not recover the situation, then a fault condition will cause the driver to halt and send a fault signal back to the ELS (if it has such a facility to acknowledge) or the CNC controller.
I couldn't personally live with the idea of lost steps being acceptable, even if only a few, because that would certainly not work when we're talking about repeatable work, particularly on diameter with a CNC lathe.
It's good to know your machine is maintaining correct position and will do so all day. It gives peace of mind compared to my previous experience whereby there was an uncertainty about parts reliably coming out to size.
The closed loop steppers are a direct replacement or substitute for conventional steppers. There's no reason that I can think of why a closed loop stepper/driver couldn't be used in this project.
The closed loop only exists between the motor and its driver - there's no need for any additional wiring back to the ELS itself.
It's probably something like this, although its holding torque may be different.
Still a stepper system, but one with a local feedback loop.
Plus 1 for the closed loop setup. Definitely the way to go for this kind of application where losing steps will spoil the thread..
|Thread: More evidence that the world has gone mad!|
|Thread: A cutting tool from nothing (Video link)|
I happend across this video and hope others find find it as interesting as I did.
|Thread: diameter calculation|
One coordinate system will always be an approximation of the other but for use in our workshops Cartesian will always be the best option. Positional errors in rotary division equipment change depending on the target radius, getting larger as the radius increases which doesn't happen in the same way when using coordinate equipment, although perpendicularity between the axes must be maintained for the machining to be reliable.
I would far rather make a division plate using a DRO on a milling machine than use a rotary table or dividing head if I wanted the best accuracy.
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