Axis not working properly

[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.