Re: Hidden counterweight
Alan Schaffter
I've got a number of issues with my Delta-
• As discussed here, the table is too heavy
• The elevation crank is located in an awkward location
• The crank is hard to turn- I suspect it has buggered pinion gears
• Even with a 4" extension on the table collar lock handle, it is still is a pain to lock and unlock the table
• Since there is a lot of play in the column-mounted rack gear, after lowering or raising the table, the work and the bit were never aligned the same- a real pain if you are changing bits to drill a deeper or concentric hole.
I came up with with a system to solve all these problem that requires just a few mods.
First I used a counter-weight system like a few of you are considering. If you plan to do that, you need to remember that to reduce the need for a large counterbalance weight (especially if you want the table neutrally balanced) you'll need a weight that is half the weight of the table and a 2 to 1 pulley arrangement. However, you'll likely end up with a long weight (mounted inside the column or not) so you will limit the vertical travel of the table since the counterweight must travel twice as far as the table. On my Delta that equates to about a maximum of 25" of table travel- fine for most projects, but questionable if trying to drill a hole in the end of a table leg.
I planned a couple of other mods to improve the ability of the table collar to slide on the column:
• Remove the existing rack and pinion crank assembly
• Remove the column-mounted rack and replace it with a specially designed rail.
• Disable the existing table lock (spacer and bolt)
• Totally change the design of the table lock
• Locking/unlocking and lifting the table would be done using a simple lever mounted at the front of the table.
• Regardless of elevation, once the table is locked, a bit would always precisely align with the same spot on the table. (For offset drilling the headstock is rotated- which what I do now anyway.)
I had planned to attempt to license my design but was discouraged when I thought more about it. It would be difficult to sell as an after-market modification kit, if I could even find a manufacturer, since there are too many different drill presses on the market, requiring too many different mod kits. I would need to deal with one of the usual suspects. Although it would be a totally different table it would be part of a larger machine and unlike stand-alone products like the I-BOX and Lock Miter Master. Negotiating royalties could have been tough. I haven't decided whether to publish any more details.