We are evaluating an inexpensive undermount soft close slide. We do closets and have mainly used side mount ball bearing slides.
After installing the drawer into the clips you can lift the box about up to about 3/8".
The clips do have up and down adjustment and I am guessing you need some play for that adjustment. When adjusted all the way up there is less play.
Im pretty sure what you are discribing is normal, however shouldnt really be any issue because there shouldnt ever be anything pushing a drawer box up. You are probably right about it being build in to suite the adjustment.
I think every undermount slide from Grass, to Salice, to Blum, and even KV sample slides would have some up-lift movement. I cant say how much because Ive never measured as already posted I dont know where an upward force would come into a drawer slide.
I would guess I could uplift even a decent quality side mount slide quite a bit.
Im sitting at my desk which has Grass Dynapros and Im not measuring with a scale or set of calipers but I would guess every drawer has 1/4" at least on the up lift and almost nothing on the down. That would seem correct to me?
A slide is not designed to work in zero gravity or upside down. Ive never had a failure with any undermount though I like some better than others for sure.
I think we're about due for the next evolution of cabinet drawer slides. This happens about every 20 years or so. Maybe you're on to something with a zero gravity slide. After all, there is discussion about colonizing the moon.
The time for magnetics is here. The new (revised) Salice Exedra Pocket door system utilizes magnets as the damping technique.
This revolutionary device is a linear magnetic damper, used in the furniture field for the first time, which ensures the perfect decelerating movement of the door.
The damper is directly attached to the main track and it guarantees a perfect and silent soft closing.
The damper is made up of 40 neodymium magnets (the strongest type of magnet commercially available), which, when it slides over an aluminum profile, generate a resistant magnetic field thereby slowing down the movement of the track.
I have had some issues with undermounts. I have had customers insist on using them and then want multiple drawers in every box. We installed everything adjust the drawer fronts perfect and then a week later they called up and said some of the drawer fronts were rubbing. Well the issue was they pile so much junk in the drawer it actually pushed the drawer down so it rubbed on the drawer below it. We went to check it out and when we empty the drawer it was perfect. That is when I told them they were only rated for 75 lbs and the warranty for the cabinet was voided due to being over loaded, they were not happy. I hated to add insult to injury when I sent them a bill for the trip to their house as well. I do not expect to get paid but I also do not expect them to call me back unless there is a real issue. We all have to keep our costs down to give people reasonable pricing!
There is no doubt that when your running super tight tolerance, full inset, cabs you will have to have some CYA in your work.
Im thankful not to run full inset regularly because its a bear. I have customers that regularly want super large pots and pans drawers (30" wide, 10" deep, 21" slide depth). I never endingly imagine those drawers packed full of cookbooks or nested sets of cast iron skillets and dutch ovens. Even moving past 80+lb rated slides there is simply no way to warranty a drawer that size when you factor in the weight of the box itself.
It would seem if your doing work regularly that will require super tight flush insets your going to have to have some wordage in your paperwork or some fairly serious conversations with your customers.
There is simply no way one can be expected to build a drawer that will hold a .03" tolerance when dead empty, when loaded with an anvil, and then when loaded with an elephant. Its just not reasonable.
Bottom mount guides have a built in disadvantage compared to side mounts when we talk how much load can be carried. There are many very robust side mounts. You would be better off using them when much loading is expected.
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