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Can we please stop components moving when switching from mm to mils and back again

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MikeDB 6 years ago

I place front panel components and SMT components on a mm grid, but have to switch to a mils grid for thru holes and sockets. I thus have to switch constantly and find the components placed on a mils grid stay rock solid, but the ones on a mm grid slowly gain an offset, maybe 0.02 mm or so at a time, which over time can result in components being over 0.25 mm out from their original position

Electron 2.0.5 Windows 10 EasyEDA 6.2.34

Comments

Frendor 6 years ago

Interesting MikeDB. Like you Mike I work in both **mils** and **mm** and often find components have moved out of line. I've always put it down to me accidentally "Knocking" the component, Now I know why! Cheers. Frendor

Electron 2.0.5 Windows 10 EasyEDA 6.2.34

MikeDB 6 years ago

@Frendor Yes I thought that at first before I noticed it was a regular and predictable occurance, and then proved it by locking some components. For some reason, all positions seem to get translated back and forth into the currently selected units in the actual database, and I think the mm->mils factor is not quite exactly 1/mils->mm factor.

Electron 2.0.5 Windows 10 EasyEDA 6.2.34

UserSupport 6 years ago

That is Precision losing issue(Known Issue) when unit changes! we doesn't have a good sulotion for it yet, if EasyEDA unit size only support Two decimal places would not have this issue. when EasyEDA support to Three decimal places, it is being difficult for solved the Precision issue at JavaScript. please don't change the unit frequently. @MikeDB @Frendor

Chrome 76.0.3809.100 Windows 10 EasyEDA 6.2.34

MikeDB 6 years ago

@UserSupport Sorry but I have to change it 10 to 20 times daily. Some components are mm based and some are mils based. This really is an important issue to fix. I suspect lots of boards are going out to fab without the owners realising some of the parts are moved.

Electron 2.0.5 Windows 10 EasyEDA 6.2.35

UserSupport 6 years ago

@MikeDB Yes, we tried serveral times, at present design, it's hard to fix, but we will keep trying.

Chrome 76.0.3809.100 Windows 10 EasyEDA 6.2.34

MikeDB 6 years ago

@UserSupport Couldn't you store each component with the units it was created in (mm or mil) and then always use that as a master and only convert to the other as a copy ? Similar to how function calls for non-arrays work in C ?

Electron 2.0.5 Windows 10 EasyEDA 6.2.35

UserSupport 6 years ago

Not really understand your description, at present， when you convert to PCB, editor will get the footprint from the server, make the copy for each part, when them placing on the PCB, all objects' unit will follow the PCB unit.

Chrome 76.0.3809.100 Windows 10 EasyEDA 6.2.34

MikeDB 6 years ago

@UserSupport Yes that's the problem. The editor should work in both units so that a component is always operated upon in its original unit (mm or mil) and never translated between the two.

Electron 2.0.5 Windows 10 EasyEDA 6.2.35

UserSupport 6 years ago

They have too, you need to know when inch to mm, there must missing some precision. all size we saved is mil, when opening, it will convert to mm, inch, depends on the unit parameter you save, no matter what unit you saved, you have to convert it to caculate, it doesn't matter witch unit type, just the how many precision we saved and used and completion the losing part

Chrome 76.0.3809.100 Windows 10 EasyEDA 6.2.34

MikeDB 6 years ago

Personally I think that's an architectural mistake. However as it is this way, can't you add significantly more precision ? I just found a component over 0.3mm from where I originally placed it.

Electron 2.0.5 Windows 10 EasyEDA 6.2.35

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