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### Question #: 7981

Question: What is the z-axis travel for your largest machine?

Current Solution

The largest CNC machine we make at this time (12/04/2015) is the GreenBull 6'x12' model. This model has 2 options for Z-axis travel.

The short-z option has a total Z travel of 5.75 inches. From that you would subtract the length of the end mill used and the thickness of the spoil board to determine the maximum material thickness. (Example: If the end mill extends 1.25" from the collet and the spoil board is .75", then the material could be up to 5.75 - 1.25 - 0.75 = 3.75 inches in thickness). This is good for most sheet-type materials.

The long-z option, used mainly for large 3D carvings, requires a custom frame and allows for up to 36" of travel.

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### Other Possible Solutions to this Question

• How much Z-axis travel does the 48x96 greenlean machine have?

The greenLean Z-axis travel is about 4" - 5"-3/4".

How much Z-axis travel does the 48x96 greenlean machine have?

• What tolerance can I expect from your largest cnc machine and the laser cutter? Also, what depth can I get on the z axis?

The largest CNC machine we make at this time (12/04/2015) is the GreenBull 6'x12' model. This model has 2 options for Z-axis travel.

The short-z option has a total Z travel of 5.75 inches. From that you would subtract the length of the end mill used and the thickness of the spoil board to determine the maximum material thickness. (Example: If the end mill extends 1.25" from the collet and the spoil board is .75", then the material could be up to 5.75 - 1.25 - 0.75 = 3.75 inches in thickness). This is good for most sheet-type materials.

The long-z option, used mainly for large 3D carvings, requires a custom frame and allows for up to 36" of travel.

The tolerance of our machines, like any machine, depends on several variables. The major variables include the manufacturing tolerance, the type of machine control used, the precision of assembly, the thoroughness of maintenance, and the initial and ongoing calibration of the machine. Because we sell kits only most of these variables are outside our control. Therefore, we are hesitant to guarantee a certain level of tolerance for an end user. However, in our experience, tolerances of .001" are readily achievable with our machines.

• what is the largest machine?

The largest machine we have is the greenBull cnc machine. There are two sizes for this machine, but the largest width is 6 feet and is intended to have 12 feet of travel length.

what is the largest machine?

• What is your shipping costs for the greenLean CNC machine to Perth Western Australia

You can determine if the country is serviceable by:
- selecting the items you want to purchase on the website
- go to the cart (shopping cart top left of any webpage)
- Enter the address and click on calculate shipping.

The webpage will return the direct rates and whether your area is serviced or not. Feel free to enter any address as long as you are able to receive the package from that address.

The shipping times are determined by the service you select in the shopping cart. If a machine is purchased, we generally have a one week lead time unless otherwise stated in the description of the machine's product page.

What is your shipping costs for the greenLean CNC machine to Perth Western Australia

• What is travel speed of the blackfoot machine ?? I read in a forum somewhere that it's around 100inches/minute. Is that accurate ??

The jog speed of the blackToe is 1000 - 1500 ipm (inches per minute). I generally set this to about 700 ipm just to be safe and 700 ipm is plenty fast for most scenarios. The cutting speed will depend on the tool (end mill) that you will use for the application, the material being used and whether a spindle or router is used. In a scenario that a spindle is used and cutting relatively hard plywood at 3/4" full depth using an Onsrud 1/4" diameter compression end mill, you can cut at around 100 - 300 ipm. Using a router would be only half the speed and cutting depth due to the poor torque.

• What is your largest format cnc router

The largest CNC machine we make at this time (12/04/2015) is the GreenBull 6'x12' model. This model has 2 options for Z-axis travel.

The short-z option has a total Z travel of 5.75 inches. From that you would subtract the length of the end mill used and the thickness of the spoil board to determine the maximum material thickness. (Example: If the end mill extends 1.25" from the collet and the spoil board is .75", then the material could be up to 5.75 - 1.25 - 0.75 = 3.75 inches in thickness). This is good for most sheet-type materials.

The long-z option, used mainly for large 3D carvings, requires a custom frame and allows for up to 36" of travel.

What is your largest format cnc router

• WHAT IS THE LEAD TIME FOR REDFROG PICK AND PLACE MACHINE?

You can expect a two week lead time for the redFrog pick and place machine.

WHAT IS THE LEAD TIME FOR REDFROG PICK AND PLACE MACHINE?

• The z-axis on my assembled machine is reversed

If your Z axis is moving in the opposite direction, go into Mach3, click on config, ports & pins, then click on the motor outputs tab. You will see the axes labeled on the left and the parameters labeled on the top of this dialog box. Toggle the dir low active for the z-axis.

What if I'm having the same issue on a different axis?

You can follow the same procedure as with the z-axis. When you get to the motors outputs tab, toggle the dir low active checkbox for the axis that you would like to change.

If you are using another control program, let me know and I will add the recommended action here.

The z-axis on my assembled machine is reversed

• What precision do the CNC machine have, for instance the 12’’ x 36’’ x 3’’?

Our machine that matches those dimensions, the blueChick, uses roller chain for both X and Y axes, and a 1/2" 5 start 10 TPI lead screw for the Z axis. The precision is generally related to repeatability and we have not does extensive measurement of these tolerances. The resolution is set at better than 1000 steps per inch.

Here is the link for the blueChick:
https://www.buildyourcnc.com/blueChickVersion42CNCMachineKit.aspx

What precision do the CNC machine have, for instance the 12’’ x 36’’ x 3’’?

• What are the tolerances of your machines?

The tolerance of our machines, like any machine, depends on several variables. The major variables include the manufacturing tolerance, the type of machine control used, the precision of assembly, the thoroughness of maintenance, and the initial and ongoing calibration of the machine. Because we sell kits only most of these variables are outside our control. Therefore, we are hesitant to guarantee a certain level of tolerance for an end user. However, in our experience, tolerances of .001" are readily achievable with our machines.

What is the likely tolerance one could achieve without continual frustration and months of tinkering?

We actually do very little tinkering with our production machine. The wood has a very small coefficient of linear expansion as compared to metals and plastic, so calibration is reduced to a very infrequent state.

As with all machines, the determination of backlash in all parts of the machine is important, managing the tightening of these points of adjustment is necessary, but are still done infrequently.

What are the tolerances of your machines?

• I'm building my own machine using your motors and drivers. What is the best dip switch settings for the 3.0 amp drivers powering the 425 oz motors

The settings that you will use for your 3.0 amp driver to properly power and turn your 425 oz-in stepper motor will cheifly depend on your application and the mechanical parts you are using on your machine. In all circumstances, the amp setting for the stepper motor (according to the datasheet) should be 2.8 amps. Use the closest setting on the driver without going over.

Here is a good rule of thumb for the microstepping which will correspond to the resolution, but wil also affect torque. You always want to try to achieve the best torque and resolution for the axis you are moving but go with the lowest microstepping possible. In cases where there is mechanical advantage, like a lead screw scenario, where for each motor revolution, the axis move a very small amount, you will want a very low microstep value. This is because the mechanical configuration will provide most of the finer resolution and you will not need the microstepping to assist in this. Increase the microstepping only in conditions where the axis is not moving smooth enough, or where there is a mechanical disadvantage. A mechanical disadvantage would be where the stepper motor is causing a great amount of movement in the axis and the resolutions suffers from this condition. Increase the microstep value up to your desired resolution, but don't go over since the torque of the motor will decrease.

• What is the best way to determine speeds and feeds for machine and bit longevity?

The speeds and feeds are generally based on the amount of flutes that are being used per pass and how hot the end mill is getting when milling.  You want to use as much of the flutes as possible on single cuts.  Make the deepest cuts you can to increase the life of the tool.  For instance, if a tool that is 1 inch in cut length and the depth per pass is 1/4", then only that 1/4" is being used for the cutting.  The 1/4" tip of that tool will wear faster.
Make sure the feedrate is as fast as possible without a cost to the edge finish.  This will keep the end mill cool since there will be minimal friction as you are always cutting into fresh cooler material.
Use the end mill manufacturer's chip load for the tool to determine the starting feed rate.

Feedrate (IPM - Inches/Min) = Spindle RPM x # of Flutes x Chip Load
See each end mill for the chip load value.

If your machine cannot achieve these feed rates, reduce the spindle RPM using this formula:
Speed (RPM) = Feed Rate (IPM) / (# of Flutes x Chip Load)

What is the best way to determine speeds and feeds for machine and bit longevity?

• WHAT LEAD TIME CAN EXPECT FOR THE BLACKTOE MACHINE?

You can expect a one week lead time for our machines.

WHAT LEAD TIME CAN EXPECT FOR THE BLACKTOE MACHINE?

• The z-axis on my assembled machine is moving in the opposite direction

If your Z axis is moving in the opposite direction, go into Mach3, click on config, ports & pins, then click on the motor outputs tab. You will see the axes labeled on the left and the parameters labeled on the top of this dialog box. Toggle the dir low active for the z-axis.

What if I'm having the same issue on a different axis?

You can follow the same procedure as with the z-axis. When you get to the motors outputs tab, toggle the dir low active checkbox for the axis that you would like to change.

If you are using another control program, let me know and I will add the recommended action here.

The z-axis on my assembled machine is moving in the opposite direction

• 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

• Is there a thrust bearing you recommend for taking the vertical forces traveling through a Z-axis lead screw?

We recommend using an anti-backlash nut with collar in addition to whichever coupling you are using.

• WHAT LEAD TIME CAN EXPECT FOR BLACKTOE SO PICK UP THE MACHINE?

You can expect a one week lead time for our machines.

WHAT LEAD TIME CAN EXPECT FOR BLACKTOE SO PICK UP THE MACHINE?

• WHAT IS THE SHIPPING COST OF MACHINE TO AUSTRALIA?

You can determine if the country is serviceable by:
- selecting the items you want to purchase on the website
- go to the cart (shopping cart top left of any webpage)
- Enter the address and click on calculate shipping.

The webpage will return the direct rates and whether your area is serviced or not. Feel free to enter any address as long as you are able to receive the package from that address.

The shipping times are determined by the service you select in the shopping cart. If a machine is purchased, we generally have a one week lead time unless otherwise stated in the description of the machine's product page.

WHAT IS THE SHIPPING COST OF MACHINE TO AUSTRALIA?

• WHAT IS THE PRICE OF ASSEMBLED MACHINES COMPLETE?

Yes, we have fully assembled machines that come complete with the spindle (and laser if needed) with sizes ranging from 1'x2' all the way up to 6'x12' or longer. We can also make custom fully assembled machines with other sizes. All of these machines are perfect for very intricate detailed work including but definitely not limited to sign making, bas relief, cabinetry, architectural model making, engraving, machine parts, automotive, custom sound enclosures (automotive or other), and other scientific application which we have delivered machine for many types of these applications.

Our machines are as follows (in order by size, larger at top):

The Fabricator Pro (although stated on the website at 4'x8') can be provided up to a 6'x12' (or longer) size. Call us for the price above the 4'x8' size.
https://www.buildyourcnc.com/item/cnc-machine-fabricator-pro-milling

The greenBull 4x, 5x or 6x CNC Machine is available fully assembled; however, you are responsible for building the table on this machine, but the price is considerably lower. The 4x, 5x, and 6x is a width specification and the length is determined by your table length.
4x: https://www.buildyourcnc.com/item/cnc-machine-greenBull-v4-4X-milling-hybrid
5x: https://www.buildyourcnc.com/item/cnc-machine-greenBull-v4-5X-milling-hybrid
6x: https://www.buildyourcnc.com/item/cnc-machine-greenBull-v4-6X-milling-hybrid

The 4'x8' greenLean CNC Router (Table bed is vertically oriented with a slant) fully assembled:
This machine is fully assembled with the overall frame. The customer would need to fasten the frame to the wall and affix a spoilboard to the bed.
https://www.buildyourcnc.com/item/cnc-machine-greenLean-v1-milling

The 4'x8' Vertical Laser XL Laser Cutter and Engraver fully assembled:
https://www.buildyourcnc.com/item/cnc-machine-vertical-laser-xl-laser-cutter

The 4'x8' blackFoot CNC Router:
This machine requires a table to be built by the customer.
https://www.buildyourcnc.com/item/cnc-machine-blackFoot-v4-milling

The 2'x4' blackToe CNC router fully assembled complete with table:
https://www.buildyourcnc.com/item/cnc-machine-blacktoe-v4-2x4-milling

The blueChick CNC Router fully assembled completel with table:
https://www.buildyourcnc.com/item/cnc-machine-bluechick-v4-milling

WHAT IS THE PRICE OF ASSEMBLED MACHINES COMPLETE?

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