Battery Box continued:
Supplies: Ace Hardware:
T-nut 5/16 - 18 $.60 ea (2)
bolts 5/16x3" $.33 (2)
washers 5/16 $.07 (2)
Need something to keep the batteries from moving around in the box. I'll refer to them as hold-downs.
Sketch out a quick plan.
Cut it out of some scrap lumber. Because the divider I added to the box isn't dead center there is a 1/2" difference between these two.
Glue and screw together.
Place hold-downs on the battery. Then drill through the side of the box and through the base of the hold-down. Here I'm checking that the hole I've drilled matches the bolt.
On the inside-the-box end of the hold-down hole I'll add a T-nut. To install a T-nut you have to create a slightly larger hole than the size of the bolt. In this case the bolt is 5/16" and the T-nut requires a 3/8" hole. After you install the T-nut it's hammered in.
In this photo you can see the T-nut installed. These hold-downs would stop the batteries from jumping up but I want them more secure. Using left over rubber mat scrap from the van floor, cut out pieces for the hold-downs.
Secure the pieces with double sided tape onto the bottom side of the hold-downs top cross piece. The rubber will act as a cushion against the top of the batteries.
Since the added rubber causes the holes in the box and in the base no longer line up take the drill and enlarge the hole in the base downwards. Don't go deeper than around 3/4".
As the bolt is inserted through the side of the box it will enter the inclined part of the hole in the hold-down. Then as you rotate the head the threads on the other end draw the bolt farther into the hold-down. This causes the hold-down to tighten down on the top of the batteries. When the bolt gets to the T-nut it's tightened into place. Everything fits very snug.
This finishes up the base portion of the battery box.
And of course my every move is being watch by Project Foreman Tiger.
Also in the picture is Tiger's assistant Bob.