On Sun, Mar 25, 2018 at 12:11 PM, old_toolmaker@yahoo.com [7x12minilathe] <7x12minilathe@yahoogroups.com> wrote:
Chris,
I found at least two types of hall effect sensors on EBay. One is a proximity sensor and the other one looks flat with three prongs. Non appears to come with any installation documentation.
Google will find a spec sheet. Don't expect "install" instructions for a basic part like this. It's a part, not a product.
Here is the sheet I found: http://p.globalsources.com/IMAGES/PDT/SPEC/440/K1139513440.pdf
Another question about steppers.The one I saw on EBay comes with a compatible driver. It would seem that one would still need some type of interface between the driver and operator to issue commands to the stepper. Is that correct and if so what would one use? A computer with software designed for this?
Yes. The driver is just that. The basic user control would be just a knob you turn to control speed and a left/off/right switch. You might do better with a computer (Arduino?) in the loop. My goal is a full CNC capability while retaining the ability to do simply jobs manually. But anything that can make pulses and a direction switch would work. Put what if you want to mill a pocket? I think you'd want the ability to program a "stop". You can add 100 features to a controller or just go with a switch. You could even build a mechanical controller -- get a 50 tooth gear and let a microswitch ride over the gear teeth. A $3 Arduino might be the best solution.
To use the driver you must provide input to two pins (1) step and (2) direction. Each pulse will step the motor some tiny faction. to make it spin you supply hundreds of pulses per revolution. The "dir" pin determine the direction of rotation.
A first class installation would have limit swatches that debacle the pulses just before reaching the limit of travel. But these motors are really not so powerful that would break the Mill if you crash into the end.
I'm waiting on thrust bearings to arrive from China then I will install the Y-Axis motor and then work on a better control system. In the video I was using a lab bench signal generator to make the puses and a simple toggle switch for direction all held together is alligator clips. The goal was proof of concept.
BTW I suggest NOT buying on eBay. The prices there are to high and if you like the part it is hard to buy an identical unit months from now. This is the best deal I have found. The seller is very reliable. That can ship from the US if you select "US" when you order. Do that as shipping form other locations is very expensive.
Stepperonline is a Chinese company but they have invested in US and European warehouses so they can ship cheap and fast to the US and Europe, Their drivers are all Leadshine with their own private label.
Chris Albertson
Redondo Beach, California
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Posted by: Chris Albertson <albertson.chris@gmail.com>
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