Jointer head speed - old Delta 4" - Router Forums
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post #1 of 11 (permalink) Old 12-13-2014, 06:24 PM Thread Starter
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Default Jointer head speed - old Delta 4"

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

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Last edited by Nickp; 12-13-2014 at 06:41 PM.
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post #2 of 11 (permalink) Old 12-13-2014, 06:54 PM
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Just went throught this with my 6" beaver in the post below.you are in the ballpark,maybe on the low end but acceptable.in researching to set up mine most three knive cutters I found reference to seamed to be in the 3500 to 4500 rpm range
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post #3 of 11 (permalink) Old 12-13-2014, 07:01 PM Thread Starter
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UPDATE...I found the manual...

It calls for a head speed of 4000 RPM with 6.5" drive pulley and 2.75" head pulley...

Are these standard sizes...? Should I slow it down...?

Nick

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post #4 of 11 (permalink) Old 12-13-2014, 07:05 PM Thread Starter
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Thank you Al...I'm finding the same...

Since I would only be using it for edge cleaning (<1") I was wondering if I could run it slower...bearings are cheap ($3.99) but retainers are not ($146)...go figure :-)

EDIT...I went back through your post...nice looking machine...hope mine comes up as good...I especially like your stand...

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Last edited by Nickp; 12-13-2014 at 07:09 PM.
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post #5 of 11 (permalink) Old 12-13-2014, 09:05 PM
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If you compare to modern machines most will give cuts/minute among the specs. Divide that by the number of knives on your head and that will give the rpm you need the cutter head to turn.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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post #6 of 11 (permalink) Old 12-14-2014, 07:24 AM
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I have a old (1950's) 4" craftsman and they recommend 4500 rpm so 4000 sounds ok
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post #7 of 11 (permalink) Old 01-08-2018, 09:13 PM
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you can get manuals at vintagemachinery.org
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post #8 of 11 (permalink) Old 01-09-2018, 02:16 PM
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Another 'toy'!
https://www.princessauto.com/en/deta...er/A-p8714933e
Everybody needs one...
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post #9 of 11 (permalink) Old 01-09-2018, 03:13 PM
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Quote:
Originally Posted by Nickp View Post
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

Regards.
Gérard
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post #10 of 11 (permalink) Old 01-09-2018, 10:25 PM
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Quote:
Originally Posted by DaninVan View Post
Another 'toy'!
https://www.princessauto.com/en/deta...er/A-p8714933e
Everybody needs one...
you make it sound like it's a bad thing...
I have that in analog and laser...

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

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