Quite some time ago I acquired an "old arn" Delta Homecraft 4" jointer, 3-blade (believe 37-290). Cleaned it up and put back together. Now need to make a better cabinet for it. Driving it is an equally old, if not older, Century 1.5hp, 115/230/1PH 1750 motor. The motor pulley is 6 inch and the head pulley is 3 inch. If my calculations are correct, the planer head would spin at 3500 RPM.
I don't have a manual so I'm not sure at what speed the head should spin. I'm guessing the motor is not original (maybe?).
Is there an optimum speed for a 4" jointer that I can shoot for...? I'm thinking model might not make a difference..?
Thanks in advance...NIck
Your settings are good enough.
Running it slower will make more little undulations or then slow the feed rate to reduce undulations.
(Some machines are built to reduce this by having more cutters like 3 blades)
There is also an optimal speed for wood cutting, but that one is not RPM's,
That is a linear speed , the speed the blade cuts.
Too slow is not optimal, especially on soft woods , to fast can make burns on wood.
This is the speed the blade travels :
A 3 inches diameter cylinder will give 3" x pi (3"x3.14) = 9.42 " per turn
This is to be multiplied by speed of turning:
9.42 x 3500 =32970 inches by minutes
to be converted in inches by second:
32970/60 =549,5 inches by second
or in feet per seconds:
549,5 / 12 =45,79 feet/second
This is about 14 m /s for the metric users or about 50 km/h or 30mph very normal.
(The cutting speed is less critical when woodworking than when cutting metal.)
This article might be interesting: https://en.wikipedia.org/wiki/Speeds_and_feeds