Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: garagecnc on May 09, 2020, 11:02:50 AM

Title: Chinese BOB preventing input signals from MPG
Post by: garagecnc on May 09, 2020, 11:02:50 AM

Hi guys, I have been trying to setup Mach3 to accept an encoder so I can thread on the lathe using the ESS.

If I wire the encoder A/B to the Chinese 5-axis bob then MAch3 does not get any signal. If I wire the encoder A/B direct to the parallel port, bypassing the BOB, it works a treat. The BOB is over here -https://warp9td.com/images/BOB_Vendors/StepperOnline/ST-V2.pdf

Has anyone else noticed this and is there anything I can do to prevent it from happening? I have tried a 4k7 resistor from 5v to the inputs but it doesn't help.

Any ideas?

Jason.

Title: Re: Chinese BOB preventing input signals from MPG
Post by: Graham Waterworth on May 09, 2020, 03:08:54 PM

The ESS has inputs for spindle encoders on port 3 so it can thread

Title: Re: Chinese BOB preventing input signals from MPG
Post by: garagecnc on May 09, 2020, 03:14:37 PM

Yep, but my signals don't get through the bob.

Title: Re: Chinese BOB preventing input signals from MPG
Post by: Graham Waterworth on May 09, 2020, 05:05:19 PM

So use something like :-

Title: Re: Chinese BOB preventing input signals from MPG
Post by: garagecnc on May 10, 2020, 07:19:37 AM

Has anybody had any luck with this, it would be nice to find a solution using the 5-axis bob and not having to buy another one.

Title: Re: Chinese BOB preventing input signals from MPG
Post by: Tweakie.CNC on May 10, 2020, 07:29:28 AM

Are you also connecting the 12-24Volt dc to your 5 axis BoB ?

Tweakie.

Title: Re: Chinese BOB preventing input signals from MPG
Post by: garagecnc on May 10, 2020, 08:40:16 AM

Yes, I have the 12v connected, the external relays and 0-10v speed control all working great.