Dealing with a mid-stop cut via Mach3, you will have to be careful if it is intentionally or unintentional. If you desire to stop your machine while in the middle of a cut be sure to stop it when the machine is moving in an upward motion on the z-axis and the X/Y-axis are stationary. Then you can choose the point (G-code) where the machine was left off and click on the Run from here button on the Program Run screen (left hand side) right above the Reset button.
(Make sure spindle/router is running before hand!)

Now if the machine stops unintentionally, and was moving in either the X/Y-axis, then it will be difficult to run the machine from the original point dealing with the coordinates might have been lost due the the machine continuing motion but via Mach3 the machine has stopped.

If this occurs to fight this issue before hand, is marking your home with the spindle/router to make a hole were your home is. Although moving it manually back to home the machine can be off by the smallest amount and could cause an inconsistent cut. If accuracy is something that can not be risked, then you can home the machine about a 1/4" or 1/2" down from the original home to start your cut on the same material but loosing that small piece.

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My typical go to solution is:

- Note the current g-code line where the machine stopped.
- If Mach3 errored and you cannot control the machine, Exit Mach3 - you may find that reset, stop does nothing to stop the spindle. When you exit mach3, the spindle will stop automatically.
- Restart Mach3. The DRO (Digital Readout) should show the correct coordinates where the machine position was before exiting Mach3.
- Scroll to the g-code line where the machine stopped. You may need to go a few lines prior to make sure you are not skipping any machining operations (which is why it is a good idea to learn the basics of g-code - don't worry, it's easy)
- Click on the "Run from Here" button.
- Mach3 will present you with a "Preparation Move" dialog box with the location that it will move to. If the coordinates shows a position that is into the material, make sure to specify a rapid height (clearance height) so the machine will move up first and then move to the location before moving down into the material. If the spindle is automatically controlled by Mach3, make sure to check the turn spindle on checkbox. If not, make sure the router or spindle is on before clicking OK.

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My cnc router stops at gcode line 50,000 and cannot finish program. They are about 150k of lines total. I have Mach3 and have bought the additional line capability. Is 50,000 (or around that) the limit? Is Mach 4 hobby license better and in what ways? Thanks! Mike Huber

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If you have a license for Mach3, then you should be able to run g-code indefinitely. I think there is something else going on.

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If you have a license for Mach3, then you should be able to run g-code indefinitely. I think there is something else going on.
What else could be going on?

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-1 OR 2+358-358-1=0+0+0+1 --

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-1 OR 2+69-69-1=0+0+0+1

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-1' OR 2+902-902-1=0+0+0+1 --

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-1' OR 2+902-902-1=0+0+0+1 --

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-1' OR 2+730-730-1=0+0+0+1 or 'Qb1SuH5C'='

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-1" OR 2+161-161-1=0+0+0+1 --

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-1 OR 2+69-69-1=0+0+0+1

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if(now()=sysdate(),sleep(15),0)

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0'XOR(if(now()=sysdate(),sleep(15),0))XOR'Z

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0"XOR(if(now()=sysdate(),sleep(15),0))XOR"Z

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(select(0)from(select(sleep(15)))v)/*'+(select(0)from(select(sleep(15)))v)+'"+(select(0)from(select(sleep(15)))v)+"*/

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(select(0)from(select(sleep(9)))v)/*'+(select(0)from(select(sleep(9)))v)+'"+(select(0)from(select(sleep(9)))v)+"*/

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(select(0)from(select(sleep(15)))v)/*'+(select(0)from(select(sleep(15)))v)+'"+(select(0)from(select(sleep(15)))v)+"*/

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-1; waitfor delay '0:0:15' --

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-1; waitfor delay '0:0:19' --

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-1); waitfor delay '0:0:15' --

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-1)); waitfor delay '0:0:15' --

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8dan23Sv')); waitfor delay '0:0:15' --

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-5 OR 898=(SELECT 898 FROM PG_SLEEP(15))--

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-5 OR 353=(SELECT 353 FROM PG_SLEEP(19))--

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-5) OR 539=(SELECT 539 FROM PG_SLEEP(15))--

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RDopsUKk')) OR 996=(SELECT 996 FROM PG_SLEEP(15))--

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*DBMS_PIPE.RECEIVE_MESSAGE(CHR(99)||CHR(99)||CHR(99),15)

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'||DBMS_PIPE.RECEIVE_MESSAGE(CHR(98)||CHR(98)||CHR(98),15)||'

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USING MACH3, MY MACHINE STOPS IN THE MIDDLE OF A PROJECT. HOW CAN IT BE STARTED AGAIN FROM POINT STOPPED?

The motor that is attached to the 4th axis is wired as follows:

The motor should have red, green yellow and blue wires coming form the motor. The red and green are paired as one coil and the yellow and blue is paired as the other coil. You can wire the motor to a 3.0 amp driver with red to A+, green to A-, Yellow to B+ and Blue to B-

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HOW DO I WIRE THE 4TH AXIS THAT YOU SELL. I HAVE MACH3 SOFTWARE. NO INSTRUCTIONS ON YOUR SITE

U - Pin1
V - Pin2
W - Pin3
Pin4 Dead

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My home made cnc is a big problem with my NC connection. When in start my spindle it will be gone wrong. It will be limith switch problem anytime. Need help thanks.

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HOW DO YOU HOOK UP THE SPINDLE TO INVERTER?

Change PD001 Source of Run Commands to '1'
Change PD005 Max operating frequency to 400hz
Change PD004 base frequency to 400hz
Change PD003 Main frequency to 400hz
Change PD006 Intermediate frequency to 2.5
Change PD008 max voltage to 220v
Change PD009 Intermediate voltage to 15v
Change PD010 Min voltage to 8
Change PD011 frequency lower limit to >100hz (120hz to start)
Change PD142 7 Amps
Change PD143 2
Change PD144 3000

Note: PD001 had to be changed back to 0 to allow for keypad control.
Note2: I had to reverse U and V to get the spindle to go forward in FWD. (reverse any two wires, u&v or w&v for example)

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HOW DO YOU SETUP THE SPINDLE INVERTER VFD?

U - Pin1
V - Pin2
W - Pin3
Pin4 Dead

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My home made cnc is a big problem with my NC connection. When in start my spindle it will be gone wrong. It will be limith switch problem anytime. Need help thanks.

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HOW DO YOU HOOK UP THE VFD TO SPINDLE?

Input to VFD:
240V Active - R
240V Neutral - S
Ground - E

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HOW DO YOU CONNECT THE INVERTER TO AC?

Change PD001 Source of Run Commands to '1'
Change PD005 Max operating frequency to 400hz
Change PD004 base frequency to 400hz
Change PD003 Main frequency to 400hz
Change PD006 Intermediate frequency to 2.5
Change PD008 max voltage to 220v
Change PD009 Intermediate voltage to 15v
Change PD010 Min voltage to 8
Change PD011 frequency lower limit to >100hz (120hz to start)
Change PD142 7 Amps
Change PD143 2
Change PD144 3000

Note: PD001 had to be changed back to 0 to allow for keypad control.
Note2: I had to reverse U and V to get the spindle to go forward in FWD. (reverse any two wires, u&v or w&v for example)

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HOW DO YOU SETUP THE SPINDLE INVERTER?

These machines are inherently dangerous. Before the machine moves, the machine should be clear of any person by a dimension of at the distance of a persons reach plus a few more feet. This is the policies we institute in our shop and what is recommend to all of our customers. Treat these machines as you would treat any major power tool in the shop.

With that said, you can certainly add some protective parts, but still keep folks away even with those installed. I would use the gantry side to do all of the mounting of the protective parts. Consider using sheet metal that you can bend and make a simple installation right on the gantry side.

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HOW DO ADDRESS THE DANGER OF THESE CNC MACHINES

When the z axis is going down, the laser turns on. When the z axis is going up, it turns off. The z axis directions is only a signal that is either 5v or 0v. That determines the direction. In vectric, you will need to set your machining operations with a very very small depth so the time it takes to get to its final depth is a very short time.

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AM NOT SURE HOW TO SET THE Z AXIS TURN ON/OFF LASER WHEN CREATE CODE. KNOW THAT ITS TYPICALLY Z-AXIS MOVEMENT DOES THIS - BUT YOU DONT SHOW ANYTHING HOOKED UP IN PLACE OF AXIS.

Check step 9 on this page: http://www.buildyourcnc.com/item/electronicsAndMotors-parallel-breakout-relay

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IF YOU HAVE CIRCUIT (OR PICTURE) OF HOW THIS RELAY IS CONNECTED TO THE ROUTER

Yes and properly soldered.

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20

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DO YOU SUPPLY THE MALE PORTION OF MOTOR CONTROL CABLES WITH REDLEAF?

There are two main questions that we can answer with respect to motor torque and the mechanical advantage of lead screws, 1) What torque motor do you need to lift a particular weight, or 2) What maximum weight will my motor torque be able to lift.

This formula uses Newtons (N) as it's final unit. Use this with the included radius (R) to determine the torque. Newtons can easily be converted to lbs or ounces using online conversions.

Effort = Sf + (Load/(2 x pi x (R/p) x Se))

where:
p = pitch of the screw
Se = screw efficiency = Standard lead screw will be between 20% (.2) and 40% (.4)
Sf = static force. This is the force that is needed to start the movement. The number may be eliminated, but it is good to use a number in the 5 N to 20 N range.
Load = the expected load that the effort will need to carry (i.e., the router and the included axis assembly that the motor will need to lift)
R = radius of the lead screw


This formula is based on the "law of the machine"

The final effort amount with its unit of newtons and R will be the torque. For example, if the effort comes to 100 N (newtons) and the R is .5 inches, then you can assume that the effort is 50 N-in since it would take twice the effort to turn form the one inch mark from the center of the shaft.

Example:

Load = 90 N (20.2 lbs)
R = 1 inch since that is the length from the center of the shaft that the motor is rated
p = 1 inch / 13 = .08 inches

Effort = 5 N + (90 N / (2 x 3.14 x (1 / .08) x .2))
Effort = 5 N + (90 N / (6.28 x 12.5 x .2))
Effort = 5 N + (90 N / (15.7))
Effort = 5 N + (5.73 N)
Effort = 10.7 N = 2.4 lbs = 38.4 oz-in

I am putting the oz-in on the end because the formula considers the distance from the center of the shaft to be one inch.

Therefore, a 425 oz-in motor would be able to lift a 20.2 lb Router with its accompanying assembly. If the assembly and router is heavier, plug in the numbers and determine the effort required.

With a bit of algebra, the formula can be rewritten to find the load:

Load = (Effort - Sf) x (2 x pi x (R/p) x Se)

Another formula that does not consider friction at all:

Effort = (Load x p) / (2 x pi x R)

Lets see if we get similar results:

Effort = (20 lb x .08 inches) / (2 x 3.14 x 1)
Effort = 1.6 / 6.28 = .255 lbs = 4.08 oz-in

The results from both formulas appear to be very small because a 13 TPI screw will have enormous mechanical advantage.

It is evident that the first formula that does consider friction that we are loosely estimating is far more conservative than the second formula. Either way, even the most conservative formula shows that the 425 oz-in motor will handle very large weights. If you are using a lead screw with only two turns per inch, .5 inch pitch, you can determine the requirements with the first formula.

Example for a 10 TPI 5 start (2 turns per inch) lead screw:

Load = 90 N (20.2 lbs)
R = 1 inch since that is the length from the center of the shaft that the motor is rated
p = 1 inch / 2 = .5 inches

Effort = 5 N + (90 N / (2 x 3.14 x (1 / .5) x .2))
Effort = 5 N + (90 N / (6.28 x 2 x .2))
Effort = 5 N + (90 N / (2.512))
Effort = 5 N + (35.83 N)
Effort = 40.828 N = 9.18 lbs = 146.88 oz-in

Customer Response:
thank you so much

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how do i calculate torque of stepper motor if lead screw coupled to motor shaft and load applied by lead screw on plate is 100 kg by vertically

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Pls


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1m 16mmdiameter ball screws calculations


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What is the max load that 2 NEMA 17 stepper motors (spaced 2 feet apart, both will be pushing up on the same gantry) can lift while using a rod with the following specifications T8 OD 8mm Pitch 2mm Lead 4mm for each motor.

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1

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HOW DO I DETERMINE THE AMOUNT OF SCREW WEIGTH THAT MY MOTOR CAN HANDLE

Temperature probe monitor. Very valuable. This keeps you up to date on your coolant temperature levels.

Voltage meter. This will tell you the exact level of voltage/power you are running telling the laser to run at instead of an arbitrary mark on a drawn wheel around your POT.

Ammeter sensitive to 1mA. This will be sure your not over driving your tube and reducing it's life significantly.

Hour meter. This will tell you exactly how long your system has been 'on' giving you a more accurate bead on the length of your tubes life.

Exhaust fan upgrade. The current fan included is 100CFM. You can buy 120mm fans that push 250CFM and I have included a guide on how to go about doing this here. http://buildyourtools.com/phpBB3/viewto ... 8cdd1802bf

To push the exhaust fan even further, if you have the room/power, I would highly recommend investing in a 600+ CFM "Dust Collector" system. 250CFM is still not suffice to draw all the smoke that can come off of 3mm or 1/8 MDF cutting job.

A cutting surface. I bought myself a aluminum 'egg crate' mesh from my local HVAC company. They are used a cover for fluorescent lights and work great for low impact cutting surface. They come in 4'x8' sheets and are easily cut to fit. The other side is if you can find a steel honeycomb cutting bed to fit. These can be quite costly or fairly affordable depending where you are looking. The benefit of a steel honeycomb is you can use high power magnets to hold material down.

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HOW CAN YOU ENHANCE THE BLACKTOOTH LASER CUTTER?

Try slowing your feedrate down and increasing spindle RPMs. End-mills will leave a poor finish if you go too fast. Make sure your cutting depth isn't too much. Maybe the endmill or cutter is blunt? Could it be the feed direction of the cutter? Some materials need to be fed in a certain direction.

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MOTOR GOING TWO DIRECTION WHEN JUST PUSH UP. IT WILL GO DOWN AND THEN GOES AGAIN UP WITH THE SAME BUTTON.

An axis is a direction of motion controlled by the CNC machine control. It can be linear (motion along a straight line) or circular (a rotary motion). The number of axes a machine has determines it's machining capabilities. A 2.5 axis machine really has three moving axes, but only two axes can move together (most machines sold today are full three axis machines). For machining centers, a three axis machine will have three linear axes. A four or five axis machine will have three linear axes as well as one or two rotary axes.

Note that 2.5 versus 3 axis has yet another context. 2.5 axis machining requires that the machine have three axes, but only two axes must be moving simultaneously at any one time. (Simple operations, like drilling and most milling, fall into this category). On the other hand 3-axis machining requires that all three axes be moving at the same time (More complex operations, like the machining of sculptured surfaces required in molds and airfoils, fall into this category.)

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WHAT IS THE DIFFERENCE IN A 2.5 AXIS MACHINE?

http://hps.org/publicinformation/ate/q5906.pdf

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HOW DO YOU CALCULATE THE ENERGY OF PHOTONEUTRONS PRODUCED THROUGH INTERACTION WITH 7.5 MEV BREMSSTRAHLUNG FROM A LINAC? TARGET GENERAL COMMERCIAL PRODUCTS IN TRUCKS.

The instructions on how to do this are found here, in these two videos, http://buildyourcnc.com/PrimeronHomingandLimitSwitches.aspx

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HOW DO I CONNECT A TOUCH PLATE TO THE BREAKOUT BOARD?

Thanks for the kind words. The kit is available for those that want the parts to assemble the case which comes with the computer parts. If you don't need the computer parts, let me know and I will offer the bare bones without the computer system.

Previous Solution:
I already have a DIY CNC machine with all my electronics but I have two cases the size of a mid tower PC and was looking to shrink the weight and footprint of all of them. I understand if you don't have plans available, I just really loved the design and compactness of your case.

Previous Solution:
The redLeaf and redSprout boxes are meant to provide enclosure to the systems that we assemble in-house for customers that prefer a complete plug and play system. We provide the kit of parts for the enclosure from overwhelming customer request. There are no plans available for the enclosure and the complexity of the parts needed to be fabricated is quite high where the task of cutting out all of the intricate parts by hand would be a larger investment in time and materials than the cost to purchase the kit.

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Just curious at what you would sell the box itself empty or the dimension files for the box for?

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DO YOU GIVE AWAY THE PLANS FOR REDLEAF/REDSPROUT BOX?

Thanks for the kind words. The kit is available for those that want the parts to assemble the case which comes with the computer parts. If you don't need the computer parts, let me know and I will offer the bare bones without the computer system.

Previous Solution:
I already have a DIY CNC machine with all my electronics but I have two cases the size of a mid tower PC and was looking to shrink the weight and footprint of all of them. I understand if you don't have plans available, I just really loved the design and compactness of your case.

Previous Solution:
The redLeaf and redSprout boxes are meant to provide enclosure to the systems that we assemble in-house for customers that prefer a complete plug and play system. We provide the kit of parts for the enclosure from overwhelming customer request. There are no plans available for the enclosure and the complexity of the parts needed to be fabricated is quite high where the task of cutting out all of the intricate parts by hand would be a larger investment in time and materials than the cost to purchase the kit.

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Just curious at what you would sell the box itself empty or the dimension files for the box for?

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DO YOU GIVE AWAY THE PLANS FOR REDLEAF/REDSPROUT BOX?