Sys 32 and Drawer slides - CONFUSION

[fritter63]

Hey all, I'm getting ready to CNC a couple of base cabinets for the shop. I'm of course going to base them off
system 32 to make it easy. I'll have the CNC actually drill the holes for me.

But looking around, I get a little confused on the drawers slides and where the system holes should be.

Of course, that front row should be at 35 mm in, but for the back of the slides, I find conflicting implementations.

Example: there his this one at McMaster-Car (which is nice because I can grab the CAD model and insert it into my 3D drawing:
https://www.mcmaster.com/#11435a26/=1843qav

Then there is this one at CS hardware (a good source for cheap slides, which I've used in the past).
http://www.cshardware.com/500mm-19-...e-mount-full-extension-65-pound-capacity.html

Comparing the two, you can see the the McMaster--Carr slides have a hole WAY at the back of the slide (453 mm from the front) which seems to make sense.

But the CS hardware one has it's last hole at...323 mm from the front (you can see it when you download the spec PDF), i.e. way forward of the back of the cabinet.

I have this CAD program parameterized so I can just change some overall dimensions and have it adjust for different cabinet sizes, but I'm not sure which of these "standards" to use.

Any insights on which I should code to? The CS hardware ones seem to be some logical multiple of 35 mm + 64mm + 32mm + 96mm, etc. So those almost look like they are the best.

Is this "True 32" vs "System 32" vs "Process 32" standards ?

 

[Bohdan]

Of course, that front row should be at 35 mm in, but for the back of the slides, I find conflicting implementations.

Actually the front row should be at 37 mm in, and the position of the back row depends on the length of the slide. There are several common middle rows and the choice is up to you. Choose whichever will suit the most common length of slide that you will use.

Have a look at http://benchmark.20m.com/tools/Festool/32mm/festool_32mmholes.html.

 

[rmwarren]

[member=10223]fritter63[/member] - not sure this will help but you can find some info comparing the various 32mm systems here:
http://www.davelers.com/32mm/files/4988_What_all_32mm_systems_have_in_common.pdf
http://www.davelers.com/32mm/

Full disclosure - I don't fully understand this stuff myself.

RMW

 

[clark_fork]

This post by Sparktrician is a keeper for the distances:

It addresses another issue entirely, that of using parallel guides for boring the holes but the distances etc are relevant to your search. Also, the drawer slide sites have PDF copies of the hole layout and distances within  the cabinetry and from the front of the cabinet. 
http://festoolownersgroup.com/festo...-and-the-parallel-guides/msg271153/#msg271153

Note: Sometimes, a FOG member will post a message that is so helpful, that it becomes method worthy and this is one such post.

 

[GarryMartin]

Of course, that front row should be at 35 mm in, but for the back of the slides, I find conflicting implementations.

Actually the front row should be at 37 mm in

37mm is only the standard "in" dimension for most "outer drawers". There is no standard "in" dimension as it depends on many variables including whether the cabinet will use a face frame or not, what the thickness of the drawer front will be, whether it's an internal drawer etc.

You need to select your drawer slides first, and then take the dimensions from the installation instructions for them. Although there may be some commonality of dimensions between manufacturers, don't take it for granted.

Different slides will advise different dimensions, and even the same slide used in differing conditions (overlay or inset drawer fronts) will use different (even sometimes multiple) hole positions from the option of hole locations provided, and will use more or less of those holes depending on the type of screw being used and the load rating of the slide!

Standards? We don't need no stinkin' standards!!!  [crying]

For example, from a popular Blum undermount slide...

[attachimg=1]

[attachimg=2]