Yes, the purpose of the dual relay is so you have the ability to control two separate relays with two separate signals. One signal will go to one of the two relays, and the other signal will go to the other relay.

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[797] Can this relay accept two separate signals?

The dual 24VDC relay can use any 24V power supply that outputs 24V DC. A great power supply that will work well with this dual 24VDC relay is this power supply: https://buildyourcnc.com/item/electronicsAndMotors-power-supply-24v-1a-dc

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[797] What power supply should I use for this relay?

The dual 24VDC relay can use any 24V power supply that outputs 24V DC. A great power supply that will work well with this dual 24VDC relay is this power supply: https://buildyourcnc.com/item/electronicsAndMotors-power-supply-24v-1a-dc

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[797] Should I use a 24V power supply for this relay?

Yes, we accept standard credit cards on our shopping cart. All you need to do is enter the credit card information in the payment area.

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DO YOU ACCEPT CREDIT CARDS MASTERCARD OR VISA

Yes, we accept standard credit cards on our shopping cart. All you need to do is enter the credit card information in the payment area.

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DO YOU ACCEPT MASTERCARD?

Sure, the USB interface has a place for 4 axes of limit switches.

Each axis can have two limit switches: one for the ++ (positive) end and one for the -- (negative) end. The positive end would be the limit switch at the end of the machine that, say the machine has a 4'x8' area, reaches a bit after the 8 foot mark. The negative end would be the limit switch behind the 0 foot location behind the origin. If the origin is in the middle, the negative would be at a little more than the -4 foot end and the positive would be at a bit more than the +4 foot end. Note that you can have more than one switch on each pin where the NC is connected in serial fashion and the NO is connected in parallel fashion (this can be seen on the diagram in the multiple limits switch section). The software configurations for the limits switches are under File -> Settings -> Limit.

A typical limit switch has three connections on it. These connections consist of COM (common), NC (normally closed) and NO (normally open). The COM would generally go to GND and the NC or the NO would go to the pin. If the NC is used, then the the switch is constantly connected until the switch is pushed (engaged) then the connection from the pin to gnd is broken (open). Use the settings in software to set whether in NC or NO configuration.

Let me know if this information was helpful (or not) by adding information to this question. Thanks.

User response:
Thank you very much for this helpful information. I'm still a little fuzzy on how the 6 limit switches physically connect to each other and to the USB breakout board. You've stated one switch (home) goes to positive and another switch (limit) goes to negative. Are all the GND prongs from all 6 switches connected to each other and going to GND on the breakout board, or no? And the NC prongs, how exactly are they connected to each other? And to the board? There has to be a diagram somewhere shows this visually, no? I don't know how to wire the switches in series or in parallel. I have already physically installed all the switches on the machine and ran the wires to where the board is. Now I just need to know where to plug these wires into the board. Also, taking into consideration that I'm using the Planet CNC software, the only settings I have pertaining to limit switches is "Enable/Disable" for each axis, and the actual limit for each axis. Nothing about NC or NO. Is that only in Mach3?
Thank you.

buildyourcnc response:
On the USB interface, the COM on the switch connects to GND and the NC or NO connects to the input pin (i.e. x++, y--, etc.)

Limit switch configuration is rather difficult to understand, especially with series and parallel. You can think of series as a single wire going from GND to the axis letter input terminal (i.e. X++ or X--). If the wire is broken, then the circuit is open (or the switch is engaged in a normally closed scenario). Normally closed is like an actual wire, and when engaged, the switch "opens" (breaks the wire). This is why we recommend in some systems that you can put many switches in series on a single pin. When one of the switches is engaged (breaking the connection) then the entire circuit of switches is broken and the machine stops.

In a parallel scenario, the state of the circuit is always broken until the one of the switches is engaged and the circuit is then closed or connected. The topology looks like a ladder. All the switches connect to both sides of the ladder and the switches are like the runs of the ladder (the horizontal bars that the feet are placed while climbing). Imagine all of the switches broken in this scenario (normally open). It would be like the ladder could be split in two, but if one of the ladder runs (switches) is closed by engaging it, then that run would connect both sides of the ladder and the two sides of the ladder would have a connection.

There is a diagram on the USB page of the various limit switch configurations. If you need more information (visual and/or otherwise), please let us know and we will immediately add that information to benefit everyone.

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WILL THE USB BREAKOUT BOARD WORK WITH MACH3?

Yes, we sell collets for the porter cable 892

http://www.buildyourcnc.com/collets.aspx

http://www.buildyourcnc.com/item/router-colletnut-router-collet-nut
http://www.buildyourcnc.com/item/router-collet-er20-router-complete-collet-kit
http://www.buildyourcnc.com/item/router-collet-!5-er20-router-collet
http://www.buildyourcnc.com/item/router-collet-!25-er20-router-collet
http://www.buildyourcnc.com/item/router-collet-!125-er20-router-collet

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WE HAVE PORTER CABLE 892, WILL YOUR COLLETS FIT?

I can't think of any reason that it would be dangerous. However, I checked with the Cellular Telecommunications Industry Association. The Chairman of the Association sent the following memo on 18 June 1999, to the Associations' Board of Directors and others:
"You may have received inquiries about wireless phones causing fires or explosions at gas stations. In particular, you may have been asked about an alleged explosion at a gas station in Indonesia. We have been unable to verify any such occurrence in Indonesia or anywhere else. Moreover, in our discussions with Shell Oil they have stated they have attempted to verify these reports and also have not been able to document any such occurrence."
Nonetheless, in an abundance of caution, some manufacturers have included language in the owner's manuals for their products that recommends wireless phone users turn off their phones while at refueling points (gas stations). In addition, we have received information that Exxon will begin issuing warning signs at all domestic gas stations advising drivers to turn off all wireless communications devices when entering Exxon gas stations.

While wireless phone owners should always consult their owner's manual for information on the use of the phone, we are not aware of any incident that would justify these concerns."

Gen Roessler, Editor
HPS website

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WILL CELL PHONES SPARK A FIRE AT THE GAS STATION?

It usually takes about three years before you get a viable crop from young grapevines. We planted grapevines at a house we built in California and the first crop that actually had enough grapes that we could actually pick and eat them was three years later. We ate them as we left town on our way to the East coast and our new home. They were growing strong when we passed by the old house some 10 years later.

A few varieties of grapes produce in two years, such as Brianna and Seyval grapes.

The good news is that grape vines usually live between 50 to 70 years, depending on the variety.

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WHEN WILL MY GRAPES GROW?

no, it will only work on anodized aluminum

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WILL THE LASER ENGRAVER WORK ON NON-ANODIZED ALUMINUM

Lettuce, or any vegetable. Also drink a cup of water before meals, it'll make you feel fuller.

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WHAT ARE THE BEST FOODS THAT WILL HELP YOU LOSE WEIGHT?

Our MAch3 USB interface boards can be located here:

https://www.buildyourcnc.com/item/electronicsAndMotors-electronic-component-breakout-Mach3-USB-Board

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I AM INTERESTED IN THE 3 AXIS COMBO USB OPTION. NOTICE YOU ENDORSE PLANET-CNC FOR USE WITH THIS BUT WILL MACH3 INTERFACE WELL BEAK OUT BOARD?

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

The machines have minimal to no backlash depending on how you apply the machine. Since the cnc machines use roller chain on the x and y axes, and the roller chain is tensioned, the backlash is nearly eliminated. I say nearly because the if you control the machine in a way that there will be excessive load on the end mill, then the machine could have a tendency to spring to one side or the other because of the length of tensioned roller chain. The movement is minor and can be eliminated with the proper control of the machine.

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I'M CURIOUS IF THESE SYSTEMS WILL ENGRAVE LETTERING ACCURATELY WITHOUT BACKLASH?

The eyebolts are used in the squaring of the machine. I would use a standard carpenters square and first run the end mill along the edge of the square to first make it parallel with the long axis. Then run the end mill along the other edge with the short axis and adjust the eye bolts and chain according to the angle that the machine is out of square.

Additional Information:

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DO NEED TO SQUARE UP THE MACHINE AND IF SO YOU HAVE INSTRUCTIONS OR VIDEO FOR THIS?

Yes Mach3 is a great program. Our 3 axis is 6'X12'X3'using all BYCNC components (incl. redsprout)

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I JUST BOUGHT THE 3 AXIS W/HEAVY GANTRY, WILL MACH 4 RUN WELL WITH THIS, AND HOW LARGE CAN GO CUT AREA

ACIP's influenza recommendations for children age 6 months through 8 years have changed for the 2011–12 season. According to the new algorithm, certain children need 2 doses of influenza vaccine this influenza season, separated by at least 4 weeks. Here is a summary:

• Children age 6 months through 8 years who did not receive AT LEAST 1 dose of the 2010–11 vaccine should receive 2 doses, separated by at least 4 weeks, REGARDLESS of their previous influenza vaccination history.
• Children age 6 months through 8 years whose influenza vaccination status from the previous season is not known should also receive 2 doses at least 4 weeks apart.
• Children age 6 months through 8 years who received 1 dose of seasonal influenza vaccine during the 2010–11 season need ONLY 1 dose this season. This is because the vaccine strains are the same this season as last season.

You may find this Immunization Action Coalition handout helpful: www.immunize.org/catg.d/p3093.pdf.

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WHICH OF OUR PEDIATRIC PATIENTS WILL NEED 2 DOSES INFLUENZA VACCINE FOR THE 2011–12 VACCINATION SEASON?