CNC over wireless

Hi Cabe

Here is a U tube video of our Bluetooth Adapters being used for cable replacement for CNC machines. This is a common application for our Bluetooth Adapters, even in the noisy CNC environment. http://www.youtube.com/LMTechnologies62

Most companies select the LM058 Bluetooth Adapter as it has an external antenna which you can change to match the range you require. http://uk.farnell.com/jsp/search/results.jsp?N=0&Ntk=gensearch_001&Ntt=LM058&Ntx=mode+matchallpartial&suggestions=false&ref=globalsearch&_requestid=779818&isGoback=false&displaytext=&isRedirect=false

Kind regards

Hazel Doughty

Hazel,

Thank you for the reply and solutions. Bluetooth in CNC applications, I never even thought to look into it.

I've read that the up and coming Bluetooth revision increases distance too.

I will have to look into this.

Cabe

Cabe

The way to increase the LMT Bluetooth Adapter LM058 range is to change the antenna. The Bluetooth module inside the adapter is Class 1 which with the standard 2 dbi antenna is up to 100m range. You can select from a range of antenna includnig a 9dbi antenna http://uk.farnell.com/lm-technologies/lm254/antenna-whip-sma-connx-9dbi/dp/1790359?Ntt=LM254 and if the adapter is surrounded by metal or any other environment where you would want the antenna to be away from the adapter you can use the magnetic base http://uk.farnell.com/lm-technologies/lm242/base-unit-sma-connx-w-1-5m-cable/dp/1790360?Ntt=LM242

So dependant on the environment and the application you can select the adapter and the antenna to match your requirements.

Hazel

Cabe

The way to increase the LMT Bluetooth Adapter LM058 range is to change the antenna. The Bluetooth module inside the adapter is Class 1 which with the standard 2 dbi antenna is up to 100m range. You can select from a range of antenna includnig a 9dbi antenna http://uk.farnell.com/lm-technologies/lm254/antenna-whip-sma-connx-9dbi/dp/1790359?Ntt=LM254 and if the adapter is surrounded by metal or any other environment where you would want the antenna to be away from the adapter you can use the magnetic base http://uk.farnell.com/lm-technologies/lm242/base-unit-sma-connx-w-1-5m-cable/dp/1790360?Ntt=LM242

So dependant on the environment and the application you can select the adapter and the antenna to match your requirements.

Hazel

I would agree.

Bluetooth uses Frequency Hopping Spread Spectrum.(FHSS) modulation.  This is a vry effective method of transmitting information in noise environments.  The reason is because it has a very narrow bandwidth.

The biggest problem, as I mentioned before, is the environmental noise.  The CNC machine will generate noise as it uses a motor to operate.   A class 1 bluetooth device has an output power of 100mW.   FCC  will restrict a commercial device to use a specific antenna.  You cannot just change an antenna on a device in order to get better gain.....This is only true on products that are already being sold.

If you have the intention to design and build your own bluetooth device then you will need to investigate the radiated emissions using the antenna you want.  Again FCC may or may not allow this device to be sold.

Hope this helps,

Chris Pinter