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Forum: About this Forum Wed 14 November 2018, 13:04
Replies: 16
Views: 426
Posted By Richards
The video that Mike suggested would let others...

The video that Mike suggested would let others look over your shoulder. If you set the G1 feed rate to a low number so that the DRO can be watched as the z-axis slowly moves, it would be easier to...
Forum: About this Forum Tue 13 November 2018, 16:11
Replies: 16
Views: 426
Posted By Richards
I guess I'm not understanding exactly the...

I guess I'm not understanding exactly the situation. In electricity, "zero" or "gnd" is the starting point, i.e., 5VDC is five volts above ground. So, the "zero" point when setting tool height, is...
Forum: 50. Toolheads Sat 03 November 2018, 23:06
Replies: 2
Views: 169
Posted By Richards
I would suggest that you hire an electrician to...

I would suggest that you hire an electrician to wire things up properly. As far as I know, a disconnect box is required for 240VAC circuits. Fuses or circuit breakers in the disconnect box are...
Forum: 70. Control Systems Wed 31 October 2018, 11:15
Replies: 1
Views: 158
Posted By Richards
In the left-side schematic in the previous post,...

In the left-side schematic in the previous post, I showed R1 at 10K and R2 at 100K. Those values work when the power supply is 24VDC, but what about a BeagleBone Green that toggles between 0v and...
Forum: About this Forum Mon 29 October 2018, 08:14
Replies: 16
Views: 426
Posted By Richards
What I noticed is that you've written about a...

What I noticed is that you've written about a "machine zero" and a "job zero". To me, that means that the "machine zero" is found by using a touch plate laid on the spoil board and the "job zero" is...
Forum: 70. Control Systems Sat 27 October 2018, 16:44
Replies: 1
Views: 158
Posted By Richards
Drive a relay via a transistor

I've received some questions about connecting a relay to a BOB with transistors. There are two drawings attached that show how easy it is.

One shows a 2N2222 NPN transistor (T1) that drives a...
Forum: 70. Control Systems Sun 21 October 2018, 11:35
Replies: 0
Views: 111
Posted By Richards
Inexpensive way to extend control box functions

With the advance in electronics, don't overlook the inexpensive ways there are to greatly extend the capability of a control box. For instance, when using a water cooled spindle, it is very...
Forum: 70. Control Systems Sat 20 October 2018, 12:34
Replies: 18
Views: 2,524
Posted By Richards
-V Because of the size of the table you listed,...

-V
Because of the size of the table you listed, ball screws and linear rails would be very costly. In that case, I would resort to using a belt-drive transmission, probably with a 4:1 gear...
Forum: 60. Wiring & Cable Management Sat 20 October 2018, 10:38
Replies: 1
Views: 171
Posted By Richards
It's time to rethink old wiring habits

I'm a creature of habit. Once I find a way to do something, I keep on doing it that way forever. Case in point: Last week I tried to make some good crimps using my "squeeze-apart" wire strippers...
Forum: 70. Control Systems Wed 10 October 2018, 23:06
Replies: 18
Views: 2,524
Posted By Richards
One thing that I neglected to mention is that a...

One thing that I neglected to mention is that a 7.2:1 rack and pinion drive with a 25-tooth pinion moves the axis 0.5454 inches per stepper motor shaft revolution. A 1605 ball screw moves the axis...
Forum: 70. Control Systems Wed 10 October 2018, 22:23
Replies: 18
Views: 2,524
Posted By Richards
A lot has changed since I wrote those early...

A lot has changed since I wrote those early posts. (I still have that original servo motor sitting on the shelf with the Geckodrive servo driver.) The ClearPath servos changed my mind.

Price:...
Forum: 70. Control Systems Fri 05 October 2018, 13:16
Replies: 18
Views: 2,524
Posted By Richards
So far, in my limited testing, I can say only...

So far, in my limited testing, I can say only good things about the Acorn board. Centroid has excellent wiring diagrams on their website that show how to connect popular stepper drivers as well as...
Forum: 70. Control Systems Thu 27 September 2018, 20:16
Replies: 18
Views: 2,524
Posted By Richards
(This is a late post. I just ran across interest...

(This is a late post. I just ran across interest on the forum for Teknic ClearPath servos and Centroid Acorn two days ago while Googling).

About a month ago, I ordered a TinyG CNC board (because...
Forum: 702. Power Supplies Sat 27 June 2015, 07:55
Replies: 134
Views: 43,129
Posted By Richards
Bazza, Mike's (Metalhead) advice is good advice. ...

Bazza, Mike's (Metalhead) advice is good advice. Using the 34HS9802 motor with a 48V power supply will give you 580 oz*in of holding torque without a belt-drive and 2,320 oz*in with Metalhead's 4:1...
Forum: 701. Motor Drives Sun 17 May 2015, 12:20
Replies: 17
Views: 6,763
Posted By Richards
Ken, It looks like you're in Malaysia. I...

Ken,

It looks like you're in Malaysia. I don't know what Oriental Motor motors cost over there. Here in America, the 34-frame size, 350-450 oz*in motors cost $135 each, postage paid by Oriental...
Forum: 701. Motor Drives Fri 15 May 2015, 12:33
Replies: 17
Views: 6,763
Posted By Richards
I like Oriental Motor because I've used over 100...

I like Oriental Motor because I've used over 100 of their motors with no motor failures and only one driver failure. I've also tested Leadshine and found that motor to be just as smooth, just as...
Forum: General - MM Build Wed 25 March 2015, 10:39
Replies: 3
Views: 2,244
Posted By Richards
Read the posts under the "Electrical and...

Read the posts under the "Electrical and Electronic" section. You should find enough information to get started on your project. The electronics used with Mach 3 will work with a lot of different...
Forum: 701. Motor Drives Fri 16 January 2015, 13:22
Replies: 1
Views: 1,817
Posted By Richards
Geckodrive announced the GM215 stepper motor drive

Geckodrive recently announced that their GM215 stepper motor driver is now available for about $250 U.S. If has a lot of features that are not needed on a CNC machine, but it has "sub microstepping"...
Forum: 701. Motor Drives Sat 13 December 2014, 12:12
Replies: 0
Views: 1,672
Posted By Richards
Use Arduino Uno to test stepper drivers and stepper motors

I'm attaching an Arduino sketch (program) that you can use with an Arduino Uno to test your stepper drivers and stepper motors. This program requires that you have a power supply connected to the...
Forum: General - MM Build Thu 21 August 2014, 12:01
Replies: 16
Views: 5,709
Posted By Richards
Look at the way ball-screws are used on a...

Look at the way ball-screws are used on a Thermwood. Vibration is kept to a minimum. I'm sure that Thermwood has a patent, but I'm not sure how patents pertain to home-use, home-built equipment. A...
Forum: Introduce yourself and start planning Tue 12 August 2014, 09:27
Replies: 28
Views: 6,297
Posted By Richards
We'll need a little more information before being...

We'll need a little more information before being able to help you test your motors. Are they hooked up to the stepper drivers? Are the stepper drivers connected to the power supply and to the PMDX...
Forum: 70. Control Systems Tue 29 July 2014, 09:07
Replies: 29
Views: 6,481
Posted By Richards
All the stepper motors that I've ever used...

All the stepper motors that I've ever used "resonate" (growl) when they're run at a low speed where the "resonating" happens. The cure is to run them faster or slower. Usually the "resonating"...
Forum: MechMates already cutting Sat 21 June 2014, 22:13
Replies: 382
Views: 53,420
Posted By Richards
Steve Stallings at PMDX designs break-out boards...

Steve Stallings at PMDX designs break-out boards properly. He uses a 10k pull-up resistor on critical inputs. His 10k plus an external pull-up is equal to 5k, which is very close to the 4.7k value...
Forum: MechMates already cutting Fri 20 June 2014, 18:19
Replies: 382
Views: 53,420
Posted By Richards
Pete, I'm sorry about the quality of the image....

Pete,
I'm sorry about the quality of the image. I use Eagle, which exports the image. As far as I know, there are no controls to darken the image. The resistors on the diode side should be sized...
Forum: MechMates already cutting Fri 20 June 2014, 13:10
Replies: 382
Views: 53,420
Posted By Richards
Fox, I agree that your schematic will work, but...

Fox,
I agree that your schematic will work, but I also know that it will not work forever. Thirty-nine years of experience building process control computers lets me know that attaching multiple...
Showing results 1 to 25 of 500

 
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