BYCNC response:

Milling aluminum is no problem with our machines.

Here is a video we recently did with our 4'x8' machine. The aluminum piece is about 1/4" thick: https://buildyourcnc.com/tutorials/tutorial-greenbull-aluminum-cutting

The accuracy you will see from our our 2.2kW spindle is entirely dependent on the precision of your build, so it's not possible to say what level of accuracy you can achieve without an examination of the complete system. However, our spindles have a runout of less than .0001 in, which includes the collets that we sell. If you use a collet from another manufacturer, we cannot guarantee this TIR (Total Indicated Runout) dimension.

For the dimension drawing of the anti-backlash nut, please contact us directly by phone or email to techsupport@buildyourcnc.com

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I have emailed waiting for your reply.

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BYCNC response:
Your email has been sent.

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HI, I HAVE INTENTION OF PURCHASING YOUR 1/2 INCH PRECISION LEAD SCREW SET TO BUILD MY CNC MACHINE, COULD THE SCHEMATIC DIMENSION ANTI-BACKLASH NUT, BEARING FOR AND SHIM? ALSO IS 2.2KW SPINDLE ABLE MILL ALUMINUM WHAT ACCURACY?

BYCNC response:

Milling aluminum is no problem with our machines.

Here is a video we recently did with our 4'x8' machine. The aluminum piece is about 1/4" thick: https://buildyourcnc.com/tutorials/tutorial-greenbull-aluminum-cutting

The accuracy you will see from our our 2.2kW spindle is entirely dependent on the precision of your build, so it's not possible to say what level of accuracy you can achieve without an examination of the complete system. However, our spindles have a runout of less than .0001 in, which includes the collets that we sell. If you use a collet from another manufacturer, we cannot guarantee this TIR (Total Indicated Runout) dimension.

For the dimension drawing of the anti-backlash nut, please contact us directly by phone or email to techsupport@buildyourcnc.com

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I have emailed waiting for your reply.

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Hi, I am still waiting for your email reply.

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HI, I HAVE INTENTION OF PURCHASING YOUR 1/2 INCH PRECISION LEAD SCREW SET TO BUILD MY CNC MACHINE, COULD THE SCHEMATIC DIMENSION ANTI-BACKLASH NUT, BEARING FOR AND SHIM? ALSO IS 2.2KW SPINDLE ABLE MILL ALUMINUM WHAT ACCURACY?

The leadscrew length for the greenBull long Z-axis is 47 inches.

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BUILDING ONE OF YOUR GREENBULL 6X LONG AND 2.2 KILOWATT SPINDLE DOES NOT FIT. SEEMS LEAD SCREW YOU SENT WITH KIT IS SHORT 42" LOOKS LIKE IT NEEDS TO BE 5 OR 6 INCH LONGER. THIS CORRECT? WHAT THE NEEDED LENGTH FOR UNIT?

The leadscrew length for the greenBull long Z-axis is 47 inches.

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Building one of your greenBull 6X Long and 2.2 kilowatt spindle does not fit. Seems lead screw you sent with kit is short 42" looks like it needs to be 5 or 6 inch longer. Is this correct? What is the needed length of lead screw for this unit?

BYCNC response:

Milling aluminum is no problem with our machines.

Here is a video we recently did with our 4'x8' machine. The aluminum piece is about 1/4" thick: https://buildyourcnc.com/tutorials/tutorial-greenbull-aluminum-cutting

The accuracy you will see from our our 2.2kW spindle is entirely dependent on the precision of your build, so it's not possible to say what level of accuracy you can achieve without an examination of the complete system. However, our spindles have a runout of less than .0001 in, which includes the collets that we sell. If you use a collet from another manufacturer, we cannot guarantee this TIR (Total Indicated Runout) dimension.

For the dimension drawing of the anti-backlash nut, please contact us directly by phone or email to techsupport@buildyourcnc.com

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I have emailed waiting for your reply.

User response:
Hi, I am still waiting for your email reply.

BYCNC response:
Your email has been sent.

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Hi, I have intention of purchasing your 1/2 inch precision lead screw set to build my CNC machine, could I have the schematic dimension of your 1/2 inch anti-backlash nut, bearing for the lead screw and the shim? Also is your 2.2kW spindle able to mill Aluminum and what is the accuracy?

No they will not come in that length as a default, we would contact the buyer to ask specific lengths due to the total length purchased.

However if you order the 1/2" lead screw we can get them cut to the specific length you require, by contacting us here or call us at 281-815-7701.

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If I order 19ft of the 1/2" lead screw will it come in three 6'5" lengths by default? This is what I need. Thanks

The settings that will have to be change will be your steps per inch in motor tuning (mach 3), or settings/axes(planetCNC). But we do not have the actual numbers/specs that will fit your 10 TPI 5 start lead screw, here is a tutorial video which explains how to get the exact numbers you need! (

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On the Book Build: I'm changing the 13TPI 1/2" lead screw with the 1/2" 10 TPI Acme screw with the anti backlash nut. This is for the Z axis only. What should I know about installing it and what are the numbers I need to plug into the motor tuning area.

You can find the required components for our scratch build CNC here(https://buildyourcnc.com/cnckitintro.aspx).

Lead Screw needed will be:
X-axis: 52 Inches
Y-axis: 32 Inches
Z-axis: 14 Inches

These will be the bearings that are specified that will be needed:
Bearings 1/2" Inside Diameter - 6
Bearings 5/16" Inside Diameter - 24

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Hi, I need the lead screws and bearings for the 4' x-axis, the 2'(?) y-axis and the 1'(?) z-axis as specified in the book 'Build your own cnc'. I am not sure which to order on your website. Thanks

We will provide shim washers as a part of machine assemblies, but when purchasing lead screw and bearings, the shim washers must be purchased as well. Please give us a call and we can send them out.

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I just ordered a 1/2" lead screw and bearings, etc. But I don't see any 1/2" shim washers for those bearings. If you have any, please toss 8 of them in the shipment and I'll gladly reimburse you.

If your bearing does not turn anymore, it is possible to repair the frozen bearing.

You can carefully remove the shield on one side of the bearing. Use a very thin blade to remove the shield.

Once the shield is removed, use WD-40 or kerosene to wash out and clean any debris that exists within the bearing. WD-40 is a cleaner, not a lubrication agent.

You will then need to re-lubricate the bearing. Packing grease into the bearing will provide good protection not allowing too much metal on metal friction. There will be a layer of grease separating the ball bearings from the inner and outer races.

If you have a production environment, you may want to purchase extra bearings so that you will not have any down time.

If you have a rubber shield, just pry it out using any sharp object, like a utility knife. If your bearing has a metal shield, there may be a retaining ring along the outer race keeping the shield in place. Simply remove the retaining ring and the metal shield will fall out easily. If the metal shield does not have a retaining ring, that shield will not be able to be removed and a new bearing will need to be purchased to replace the frozen bearing.

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You built the first 36 inch Blue Chick for me. One of the V-Groove bearings on the X-axis froze. Is there a method of repairing this? Or do I order another and a spare. If so, what is the procedure to repair or order?

The formula and calculation is a starting point to get into the area of steps per inch. You will then need to use the mach3 calibration utility to get the exact steps per inch.

Formula:
step per inch = (motor steps * microstepping) / (travel at one turn of the motor in inches)
if microstepping is set at 16 (1/16 on the driver) then and you are using a sprocket and chain with a pitch of .25 inches and 12 teeth on the drive sprocket
= (200 * 16) / (12 * .25)
= 3200 / 3
= 1066.666 steps per inch

For lead screw that has a travel of .5 inches at one turn like the 5 start 1/2 inch lead screw and using 4 microsteps per step (1/4):
= (200 * 4) / (.5)
= 800 / .5
= 1600 steps per inch

Remember to use the mach3 calibration wizard and double check the driver microstep setting.

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WHAT IS THE FORMULA TO DETERMINE STEPS PER INCH OR RESOLUTION FOR EACH AXIS?

Dealing with our USB BoB, the potentiometer that will be used in the key jog, is a 5V, 5k - 10k Ohm potentiometer.

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I am building a cnc mill using your USB controller and i would like to know what is the specification of potentiometer used for adjusting manual axis jog speed

The maximum length we can ship is a total of 78" inches. However we can send your required length in portions. Please refer to adding the total items you require to your cart to get a visualized amount and shipping cost.

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Regarding 1/2" 5 start and 10 TPI ACME precision lead screw, what the maximum length you can ship within USA? I'm looking for something like 100" and I could use a 1" screw if available. Please include estimated price. Thanks.

Surely you know the brand motors you sold me?

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I bought your 3 axis combo and need to know what name brand is the motors and their ounces and the drivers

Changing your lead screws from a tight to a lose lead will definitely make your machine move faster as long as your stepper motors can handle the new torque that the lead screws will impose.

Here is an example of a speed change from one lead screw to another:
- Existing constants in the example: Stepper Motor steps 200, microstepping 1/8 making the total steps 200 * 8 = 1600.
- Old lead screw: 1/2" allthread = 13 threads per inch (UNC)
- New Lead Screw: 1/2" 5 starts, 10 TPI = 10 / 5 = 2 turns per inch

Old lead screw would achieve a steps per inch of:
1600 / (1 inch / 13 turns) = 20,800 steps per inch (You can also express the calculation as 1600 * 13 = 20,800 steps/inch)

New lead screw would achieve a steps per inch of:
1600 / (1 inch / 2 turns) = 3200 steps per inch

You can see that the new lead screw requires far fewer steps to get to the same length of travel. If you maintained the same velocity for both examples, the new lead screw would travel the same distance 13/2 = 6.5 times faster. So, if your velocity was say 10 ipm, your new velocity would be 65 ipm. That would translate to far fewer burned edges and longer end mill life!

Just remember, confirm that your motors will be able to handle the new lead screw. You will need to reduce the steps/inch causing the motor torque to increase quite a bit, so you should be fine.

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I want my cnc to move quicker. I want to update my lead screws. will this make my cnc move quicker on all 3 axis. If it would which lead screw is better 2 turns per inch or 5 turns per inch.

Inside Diameter: 1/2" (actual dimension 0.4975 inches or 12.63 mm)

- Outside Diameter: 1.122 inches or 28.4988 mm

- Thickness: .31 inches or 7.89 mm

Thank you for this question as it caused me to update the description:
https://www.buildyourcnc.com/item/bearing-!5-standardbearing

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What are the other two dimensions of the 1/2" ID bearings used to support lead screws?

The bluchick CNC router is a perfect small format CNC that can handle most jobs. Please check here to see the latest information on this CNC router. blueChick CNC Machine. The machine can be purchased assembled. Al you will need is a computer and spindle.

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I'm looking for a complete CNC router, out the box ready to use system. Computer and software. What do you suggest? I need a working area of 12"x24"

Here is the formula for steps/inch (steps per inch)

Steps = how many steps for a full ration of the motor = standard motor steps x number of microsteps for each step
Standard motor steps for our stepping motors is 200 steps per revolution.
Microsteps are selected on the driver and are shown as full, 1/2, 1/4, 1/8, 1/16, 1/32 etc... Use the denominator for the number of microsteps per step.

Inches = how far the travel is for one full rotation of the motor. For the 1/2" - 13 TPI (threads per inch), the travel length will be 1"/13 or .076923". So, for one revolution of the motor, the travel distance will be .076923 inches.

So, the steps = 200 * microsteps, let's make this 1/4 just for the formula.
The inches will be .076923. Plug those into the formula:
Steps / inch = (200 * 4) / .076923 This can also be written as:
200 * 4 / (1 / 13) = 10,400



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I am asking what to set my steps per using your kit stepper motors and a 1/2"x13 lead screw with Mach3

When you add a specific length to your cart, the additional length will be in inches.
So you will need to add the total length which will be 98" in total!

If this is for the scratch build kit (book CNC) the total length (98") of lead screw you will need for this machine is the three axes added together:

X-axis: 52"
Y-axis: 32"
Z-axis: 14"

You will have to specify the dimensions you require by sending a email (with your order details) or call to: customerservice@buildyourcnc.com or 281-815-7701

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Does "Additional Length" for the Lead Screw mean Additional Length in inches? So for the 4' x-axis I have to choose Additional Length=52?