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### Question #: 485

Question: HOW MUCH MOTOR CABLE DO I NEED FOR A BLACKFOOT

Current Solution

The blackfoot requires a total of 50 feet of cable.

The X axis needs 15 feet
The Y axis needs 17 feet
and the Z-axis needs 18 feet

These are 20 gauge 4 conductor cable.

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### Other Possible Solutions to this Question

• HOW MUCH MOTOR CABLE FOR THE BLACKFOOT?

The motor cables for the blackToe are as follows:

Total 30 feet

X - 9
Y - 10
Z - 11

HOW MUCH MOTOR CABLE FOR THE BLACKFOOT?

• MOTOR CABLE FOR BLACKFOOT

The blackfoot requires a total of 50 feet of cable.

The X axis needs 15 feet
The Y axis needs 17 feet
and the Z-axis needs 18 feet

These are 20 gauge 4 conductor cable.

MOTOR CABLE FOR BLACKFOOT

• HOW MUCH MOTOR CABLE SHOULD PURCHASE FOR THE BLUECHICK

The recommended total length of motor cable should be 15 feet for the blueChick v4.2

Z - 6 feet
Y - 5 feet
X- 4 feet

20 AWG 4 conductor

If your drivers will be positioned farther from the machine, you may need longer cable.

HOW MUCH MOTOR CABLE SHOULD PURCHASE FOR THE BLUECHICK

• THE BLACKTOE REQUIRES HOW MUCH MOTOR CABLE

The motor cables for the blackToe are as follows:

Total 30 feet

X - 9
Y - 10
Z - 11

THE BLACKTOE REQUIRES HOW MUCH MOTOR CABLE

• HOW MUCH SILICONE TUBE DO I NEED FOR A GREEN LEAN TO CONNECT THE SPINDLE

The greenlean requires 56 feet of 1/4 Inside Diameter and 3/8 Outside Diameter silicon tube for the spindle.

20

20

HOW MUCH SILICONE TUBE DO I NEED FOR A GREEN LEAN TO CONNECT THE SPINDLE

• MOTOR 4 CONDUCTOR CABLES FOR BLACKFOOT

The blackfoot requires a total of 50 feet of cable.

The X axis needs 15 feet
The Y axis needs 17 feet
and the Z-axis needs 18 feet

These are 20 gauge 4 conductor cable.

MOTOR 4 CONDUCTOR CABLES FOR BLACKFOOT

• WHAT CABLE LENGTHS SHOULD USE FOR THE BLACKFOOT CNC MACHINE

The blackfoot requires a total of 50 feet of cable.

The X axis needs 15 feet
The Y axis needs 17 feet
and the Z-axis needs 18 feet

These are 20 gauge 4 conductor cable.

WHAT CABLE LENGTHS SHOULD USE FOR THE BLACKFOOT CNC MACHINE

• If I use a Porter Cable 3-3/4 router motor what size stepper motors do I need?

You can use the standard electronics combo: http://www.buildyourcnc.com/item/electronicsAndMotors-3axis-425-elcombo. The size of the stepping motors are generally sized with the overall machine structural weight, inertia of parts, the type of mechanical parts used to move the axes, and actually, less by the router which is more connect to how the machine is controlled.

If I use a Porter Cable 3-3/4 router motor what size stepper motors do I need?

• CABLE LENGTHS FOR THE BLACKFOOT

The blackfoot requires a total of 50 feet of cable.

The X axis needs 15 feet
The Y axis needs 17 feet
and the Z-axis needs 18 feet

These are 20 gauge 4 conductor cable.

CABLE LENGTHS FOR THE BLACKFOOT

• WHAT LENGTH OF CABLE DO I NEED FOR A BLAKCFOOT

The blackfoot requires a total of 50 feet of cable.

The X axis needs 15 feet
The Y axis needs 17 feet
and the Z-axis needs 18 feet

These are 20 gauge 4 conductor cable.

WHAT LENGTH OF CABLE DO I NEED FOR A BLAKCFOOT

• I need a customised blackfoot without spindle but mount for vacuum pump pick and place.What software do I need and what's the quote

We currently do not have that application implemented in our design. please suggest this in our R/D section (http://buildyourcnc.com/ResDev.aspx).

I need a customised blackfoot without spindle but mount for vacuum pump pick and place.What software do I need and what's the quote

• how do I build the blackfoot?

the blackFoot is built using the online instructions found here: http://buildyourcnc.com/Item/cnc-machine-blackFoot-v4

how do I build the blackfoot?

• I have a BlackFoot with a 3.25hp Porter Cable router. What is a safe starting IPM to optimize feed rate? How fast do you guys run full depth passes through MDO or MDF?

It is not recommended that standard routers do full depth passes. This is better done with a spindle. For best results with routers, we recommend a depth that equals the cutting diameter of the end mill. The IPM will relate to the chip load of the end mill (look up the formula online and add it here). The IPM will also depend on the end mill diameter, the larger the diameter, the faster the feedrate. A 1/2" end mill can cut about 300-500 ipm where a 1/4" end mill will be able to cut at 80-120 IPM, at a depth equaling the cutter diameter using a router. With a spindle, the same feedrates can be applied, but with more depth per pass. For instance, an MDF full depth cut at 3/4" can be cut at the 100 IPM using a 1/4" cutter.
Here is a basic setup we have for our blackFoot (default setting):
X-Axis
SPI: 914.29
Acc: 400.02
Vel: 5
Y-Axis
SPI: 1422.22
Acc: 400.02
Vel: 5
Z-Axis
SPI: 1600
Acc: 400.02
Vel: 79.98

I have a BlackFoot with a 3.25hp Porter Cable router. What is a safe starting IPM to optimize feed rate? How fast do you guys run full depth passes through MDO or MDF?

• ok I Build my CNC machine table and now need a complete set for motor and software how you can help me

Yes, I will need to know more specifics of the machine so I can recommend the correct electronics.

ok I Build my CNC machine table and now need a complete set for motor and software how you can help me

• Besides the blackfoot what else will I need to purchase.

PC with parallel port and USB port
20awg stranded wires for the motors - http://www.buildyourcnc.com/electronicscombo.aspx
18awg stranded wires for power supply to drivers
24awg stranded wires for breakout board to drivers
(location and spacing of components varies from one person to another, so we do not provide cables/wires)
- General purpose extension cord (cut the female end off) to provide power to power supply
- USB cable to power breakout board
- Parallel cable to communicate to breakout board
- Router
- (optional - instead of router) Spindle with power inverter http://www.buildyourcnc.com/SpindlesAndAccessories.aspx
- (if purchasing spindle with inverter) General purpose extension cord (240v) (cut the female end off) to provide power to power inverter
- End Mill(s) http://www.buildyourcnc.com/ProductsEndMills.aspx
- CAD, and/or CAD-CAM software (to produce geometry, machine operations, and g-code) http://www.buildyourcnc.com/CNCsoftware.aspx
- CNC control software (to read g-code and control machine) http://www.buildyourcnc.com/CNCsoftware.aspx
- If the machine does not have the table included, then a table will need to be built. The rails, chain and chain mounts are included that are used on this table.

Besides the blackfoot what else will I need to purchase.

• HOW CAN I KNOW MUCH WEIGHT MY MOTOR CARRY?

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)

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

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

Pls

1m 16mmdiameter ball screws calculations

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.

1

HOW CAN I KNOW MUCH WEIGHT MY MOTOR CARRY?

• What will be the amount of cable carrier that I will need for a greenBull 5x?

To determine the length of cable carrier you will need for a single axis, measure the axis travel of your machine, divide this by 2 and add 12 inches. The radius of the curl is 2 inches.
The amount of cable carrier needed for the CNC machines that we provide will be:

blueChick: Total 4 Ft

blackToe: Total 5 Ft

blackFoot: Total 8 Ft

greenLean: Total 8 Ft

greenBull 5x: Total 10 Ft

greenBull 6x: Total 11 Ft

What will be the amount of cable carrier that I will need for a greenBull 5x?

• MOTOR CABLE LENGTH FOR BLUECHICK

The recommended total length of motor cable should be 15 feet for the blueChick v4.2

Z - 6 feet
Y - 5 feet
X- 4 feet

20 AWG 4 conductor

If your drivers will be positioned farther from the machine, you may need longer cable.

MOTOR CABLE LENGTH FOR BLUECHICK

• Is there an option for 4th axis on blackfoot?

You can add a head stock and tail stock on the blackFoot by designing the table in a way the head and tail stock is positioned at the correct level so the end mill will be at the correct position. The correct position will depend on the end mills that you will be using. The end mill should be centered to the center of the head stock jaw near the lowest z-axis position.

Is there an option for 4th axis on blackfoot?

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