Vintage Craftsman 150 Drill Press - Restore/refurb

[hman]

Beautiful press, you my friend are very lucky to find that press for such a paltry sum of money. Good luck with a gorgeous drill press.

Thank you. Sold it to a friend nearby (Rick Sparber, a member of this forum) for not-too-much. He's added a counterweight to the table.

Reading this was like watch two shop teachers correcting a student or apprentice . I look at the vari speed but can't see how it works. Dose it use clutches ,, Phillies,,, that slide open and closed??? Thanks just interested in the how it works.

The variable speed is accomplished with variable pulleys. This Youtube shows how a single pair of variable pulleys works:

See also "CVT" (continuously variable transmission).

The drill press takes this idea to a higher level, with two sets of "paired" variable pulleys. See post #14 for photos.

The speed adjuster changes the spacing between the (fixed width) spindle pulley and second pulley set. Changing the spacing causes the V-belt to ride inward or outward in the lower section of the second pulley. The outer flanges are fixed, so it's the middle "flange" that moves up or down. The driving diameter of the second (upper) belt is therefore changed in the opposite manner.

The spacing between the second and third pulleys is fixed by the lower and upper bars. As the belt moves inward or outward in the second pulley, it moves inward/outward in the third pulley, in turn changing the position of the middle flange and the driving diameter to the third (motor) belt. The motor pulley has a fixed diameter.

Both ratios increase and decrease together, multiplying/amplifying the effect of adjustment changes. The overall ratio can be varied by a factor of 12 (300 to 3750 RPM at the spindle).

It's a bit hard to explain in words. Shoulda taken a video! Watching it run would get the whole idea across pretty quickly.

 

[Silverbullet]

Thank you. Sold it to a friend nearby (Rick Sparber, a member of this forum) for not-too-much. He's added a counterweight to the table.

The variable speed is accomplished with variable pulleys. This Youtube shows how a single pair of variable pulleys works:

See also "CVT" (continuously variable transmission).

The drill press takes this idea to a higher level, with two sets of "paired" variable pulleys. See post #14 for photos.

The speed adjuster changes the spacing between the (fixed width) spindle pulley and second pulley set. Changing the spacing causes the V-belt to ride inward or outward in the lower section of the second pulley. The outer flanges are fixed, so it's the middle "flange" that moves up or down. The driving diameter of the second (upper) belt is therefore changed in the opposite manner.

The spacing between the second and third pulleys is fixed by the lower and upper bars. As the belt moves inward or outward in the second pulley, it changes the position of the middle flange in the third pulley, and in turn the driving diameter to the third (motor) pulley. The motor pulley has a fixed diameter.

It's a bit hard to explain in words. Shoulda tooken a video! Watching it run would get the whole idea across pretty quickly.

Ok that explains it it has two sets of sliding pulleys good stupid spell Ck wrote Phillies .