Axis not working properly

[Georgehun]

Hi Jazzcnc

Problem solved
The CNC is working now.
It was my mistake,I thought I replaced both of the files he sent me but obviously not. I did it again today and now it's fine.
However I thinking it's a big job to add on limit switches to the machine? Probably not just a simple job specially need to get the mach3 altered to....
Most of the time I use a same program on to the machine so one's is set it should be fine but later on I want to use it for different Jobs.
Only one thing is still worrying.
When the gantry motors not worked properly just one was running so I wonder if they are slightly off set eachother?
How I can get that fixed?
I take some measurements and looks have a few mm different.
Regards
George

[JAZZCNC]

However I thinking it's a big job to add on limit switches to the machine? Probably not just a simple job specially need to get the mach3 altered to....

No, it's not a big job, this is one of the things I've supplied and helped others with on these machines. The KK01 breakout board he's fitting as got the spare Inputs.
You will need to make some brackets to mount the switches plus the switches and cables themself. Also, I would advise using switches that work with 24Vdc power, like inductive proximity sw, to lower any chances of electrical interference. In which case you will need a 24Vdc PSU as there is only a 5V PSU in the control box.

Setting up mach3 to use them is very simple.

Most of the time I use the same program on to the machine so once is set it should be fine but later on I want to use it for different Jobs.

Not really, without Home switches then you won't be able to use the same point because every time you shut down Mach3 it will lose the position and you will have no way to accurately find the WORK ZERO.
This is the function of HOME switches as they provide a FIXED reference point that never changes called MACHINE ZERO, which you can then use to find the WORK ZERO you last used. Or for instance, if you lose position when breaking a tool or hitting E-stop while the machine is moving.

Only one thing is still worrying.
When the gantry motors not worked properly just one was running so I wonder if they are slightly off-set each other?
How I can get that fixed?
I take some measurements and looks have a few mm different.

This is the other function of HOME switches, On a machine that uses Two motors slaved together you have one switch at each side and they can be used to set the gantry square when HOMING.

To be honest I can't believe they get away without supplying at least LIMIT switches as it's a basic safety feature and the cost is minimal considering the price he's asking and the cheap low-quality components he's fitting to the machine means he's got more than enough profit to do so.
Also, it's very easy to share the switch to do HOME and LIMIT duty's so there is no excuse.

My advice is to fit them ASAP if you want to work accurately and safely.

[Georgehun]

Agree with you
I want a safe working machine so I'm happy to do the modification or asked some to do it
So what sorts of money we talking about to get it done?
I thought they are very difficult to do so that's why cutting corners.
Well I can't say about quality of the parts I'm "just" a user but most of the things are Chinese stuff but I'm not surprised.

[JAZZCNC]

Agree with you
I want a safe working machine so I'm happy to do the modification or asked some to do it
So what sorts of money we talking about to get it done?
I thought they are very difficult to do so that's why cutting corners.
Well I can't say about quality of the parts I'm "just" a user but most of the things are Chinese stuff but I'm not surprised.

The cost and difficulty will depend on how you want to do it.?

If you just want to do it the cheapest way then fit just HOME switches and use the Cheap Micro switch type. You can then setup SoftLimits to protect you from crashing into the sides etc.
The Microswitch type is not as accurate and more easily damaged than the proximity type but they are cheap and will mean you can get away without requiring a 24Vdc PSU and use the 5V PSU in the control box. However, they are more prone to interference and less accurate.

These switches you can buy from £1 each up to £50 depending on quality, size, etc. You'll also need a 3 core shielded cable which will be about £1 - £2 per meter.

The next method is again to just fit HOME switches but use proximity type. They offer more accuracy and are less prone to damage, the downside is they require 6 to 36Vdc to work so your 5V won't be enough so will require another PSU, 12 or 24Vdc are usually used, 24Vdc is the better option as it provides better immunity from electrical interference.

These cost around £5 each and the 24Vdc PSU will be between £10-£20. Again 3 core shielded cables will be required.

The third method that won't cost much more money but will require more work fitting is to use Proximity switches that travel with each axis and work as both HOME and LIMITS.
They do this by sensing a Target located at each end of the machine when working as limit switches while cutting etc, but when HOMING the LIMITS are ignored as it slowly travels towards the Target so the danger is limited.

The last method but the best method and most costly method is to fit both separate home and limit switches.
This can be done with a mixture of cheap Microswitches for the LIMITS with a fixed switch at each end of the travel which doesn't need any accuracy. Then fit higher accuracy switches for the HOMING, these can be either fixed or traveling.

Now for a machine this size then I would say just fit proximity HOME switches and let the soft limits protect you from crashing. This way you have better HOMING accuracy but keep the costs down because you won't require as much wire. You will however need the 24Vdc PSU.

If you are on a tight budget and don't require better accuracy then do the same but using Micro switches and the 5V supply you already have. You'll do this for under £20.

Any of them is far better than not having any at all and Soft limits work very well but require HOME switches to work properly as the Limits are set from the MACHINE ZERO position.

There is one other POOR MANS option that doesn't require any switches and will let you set MACHINE ZERO with some repeatability and along with SOFT LIMITS keep you safer and allow you to find WORK ZERO with reasonable accuracy.? . . . Run the machine slowly into the end stops and set REF ALL HOME at this position every time you start the machine or lose position thru crashing or E-stop.

It's crude but can be effective if the end stops are accurately lined up at each side.

[Georgehun]

The cost and difficulty will depend on how you want to do it.?

If you just want to do it the cheapest way then fit just HOME switches and use the Cheap Micro switch type. You can then setup SoftLimits to protect you from crashing into the sides etc.
The Microswitch type is not as accurate and more easily damaged than the proximity type but they are cheap and will mean you can get away without requiring a 24Vdc PSU and use the 5V PSU in the control box. However, they are more prone to interference and less accurate.

These switches you can buy from £1 each up to £50 depending on quality, size, etc. You'll also need a 3 core shielded cable which will be about £1 - £2 per meter.

The next method is again to just fit HOME switches but use proximity type. They offer more accuracy and are less prone to damage, the downside is they require 6 to 36Vdc to work so your 5V won't be enough so will require another PSU, 12 or 24Vdc are usually used, 24Vdc is the better option as it provides better immunity from electrical interference.

These cost around £5 each and the 24Vdc PSU will be between £10-£20. Again 3 core shielded cables will be required.

The third method that won't cost much more money but will require more work fitting is to use Proximity switches that travel with each axis and work as both HOME and LIMITS.
They do this by sensing a Target located at each end of the machine when working as limit switches while cutting etc, but when HOMING the LIMITS are ignored as it slowly travels towards the Target so the danger is limited.

The last method but the best method and most costly method is to fit both separate home and limit switches.
This can be done with a mixture of cheap Microswitches for the LIMITS with a fixed switch at each end of the travel which doesn't need any accuracy. Then fit higher accuracy switches for the HOMING, these can be either fixed or traveling.

Now for a machine this size then I would say just fit proximity HOME switches and let the soft limits protect you from crashing. This way you have better HOMING accuracy but keep the costs down because you won't require as much wire. You will however need the 24Vdc PSU.

If you are on a tight budget and don't require better accuracy then do the same but using Micro switches and the 5V supply you already have. You'll do this for under £20.

Any of them is far better than not having any at all and Soft limits work very well but require HOME switches to work properly as the Limits are set from the MACHINE ZERO position.

There is one other POOR MANS option that doesn't require any switches and will let you set MACHINE ZERO with some repeatability and along with SOFT LIMITS keep you safer and allow you to find WORK ZERO with reasonable accuracy.? . . . Run the machine slowly into the end stops and set REF ALL HOME at this position every time you start the machine or lose position thru crashing or E-stop.

It's crude but can be effective if the end stops are accurately lined up at each side.

Thank you for the explanation
Well I mean I haven't got a budget but I was hoping if I can get it under 100£ if I able to doit myself that would be great.
I would love to use the CNC soon as possible it's should be running a month ago to be honest and probably this weekends gonna be the first try.
Home button is a must I would say and the limit switches to.

[Georgehun]

Great advice and well explained.
I definitely want to do some work done but I have no idea where to get this parts what is the recommended switches etc.
I'm happy to spend money on it and it's a piece of mind to.
Only I hope now it's not that difficult to do it so I can manage for myself?
I never done nothing like it before but it would cost lots of money to send the machine away to get this done.
As I said I'm kind of the user's side not for building machines but I'm happy to do myself if not to complicated.
So obviously if I start doing things like that probably my guarantee is over.....if I got any to be honest.
So you mentioned you selling those bits so could you send me a link where I can get those bits ordered?
And I find any tutorial videos for fitting those bits?

[JAZZCNC]

Great advice and well explained.
I definitely want to do some work done but I have no idea where to get this parts what is the recommended switches etc.
I'm happy to spend money on it and it's a piece of mind to.
Only I hope now it's not that difficult to do it so I can manage for myself?
I never done nothing like it before but it would cost lots of money to send the machine away to get this done.
As I said I'm kind of the user's side not for building machines but I'm happy to do myself if not to complicated.
So obviously if I start doing things like that probably my guarantee is over.....if I got any to be honest.
So you mentioned you selling those bits so could you send me a link where I can get those bits ordered?
And I find any tutorial videos for fitting those bits?

I will PM you regards the parts and give you my email. I'll gladly guide you thru setting up and the wiring side, it's not difficult.

The fitting side you will need to work out for your self because it's machine dependant where you locate them, when you have the switches in your hand it will be easier to see the best place to fasten them and where wires will run etc. You'll need to make brackets to hold them but they don't need to be anything fancy, just strong.