Some time ago I posted about the Z axis power feed modification I made for my Optimum BF20 mill, (I believe these machines are marketed as Grizzly G0704 in the US). The motor and the speed control and the electrics were obtained from a cheap scroll saw and are ideal for this modification. The power feed has been operating for over a year and has not given any trouble. It is of great assistance as the head of the mill is quite heavy and manually winding it up and down soon lost its appeal. One irritation still remained and that was adjusting the cutting depth of the tool, this was still done manually with the feed wheel located at the top rear of the machine. This was not too much of a problem when standing, however on long jobs I find that I have to sit, (keeps my brains warm), otherwise my back will give me buggery the next day. When sitting, the feed wheel is difficult to reach so I decided to relocate it to the front. The bevel gears came from an old hand drill (remember those!) and it wasn't a lot of trouble to mount them as per the pictures. I spring loaded the shaft so the pinion is permanently disengaged, This prevents the feed wheel from spinning when the power travel is engaged. To increase the cutting depth is now very easy and comfortable for the operator. A gas lift has been incorporated to ease the load on the power feed motor and whilst I was at it I added a cooling fan for the motor, 12v computer fan. The power feed electrical box has been moved to the left of the machine. All in all I was pleased with the results. I have been very happy with this mill and would recommend it without reservation, these modifications make it even more enjoyable. Cheers, Peter.
