|
|
|
Equipment
Tools
Drill Press Upgrade
| I had so much success at converting the band saw to run slower for
metal cutting, that I decided to do the same to the drill press. I chose
a 1 3/4" pulley for the motor and a 8 1/4" pulley for the jack shaft. I
moved the switch from the back of the drill press to the front for safety
and convenience. Below is a chart of the calculated speeds and ratios. |
 |
 |
|
Sprunger drill press before upgrade.
|
 |
 |
| Switch moved to front of drill. |
Motor with old switch on base plate. |
 |
| Jack shaft and motor speed reduction upgrade. |
Speed and Ratio Charts
|
Motor Pulley
|
Jack shaft pulley
|
Ratio
|
|
1.75
|
8.25
|
4.71
|
|
Motor Step Pulley
|
Quill Step Pulley
|
Ratio
|
Old Speeds
|
New Speeds
|
|
4.985
|
1.735
|
2.87
|
5,028
|
1,067
|
|
3.97
|
2.94
|
1.35
|
2,363
|
501
|
|
2.915
|
3.996
|
0.73
|
1,277
|
271
|
|
1.745
|
4.995
|
0.35
|
611
|
130
|
|
|
