Rockwell Model 20 Vertical Band Saw Manual
Mike,There are VFDs that work just fine on single phase 120VAC or 240VAC. They will produce whatever voltage you need and three phase. IMO a VFD is a better way to go.I have the exact same model number saw as you. The cable is for the speed indicator up on the column (just above switch.)You can still get tires directly from Delta/Porter-Cable but they ain't cheap. I paid $48/each when I got mine.There are various systems for controlling the Reeves drive on these saws. Some use a cable, some use some sort of ever and some use a chain (or something.)If yours has the Hi-Lo (2 speed) gear box then it should also be a metal cutting bandsaw.
This is a reproduction, not a photocopy, of an original Delta-Rockwell 20″ Wood Cutting Band Saw Operating and Parts Manual. This manual contains information on lubrication, adjustments, maintenance, and controls as well as a complete parts list with exploded view diagrams. View & download of more than 181 Rockwell PDF user manuals, service manuals, operating guides. Power tool user manuals, operating guides & specifications. Find many great new & used options and get the best deals for Rockwell 20' Metal Wood Band Saw Parts Manual 28-345 0602 at the best online prices at eBay!
If you still have the speed indicator plate it will be obvious.-DU. Not sure what you meant by the motor not being able to take a VFD. That said there are motors that are designed to work with VFDs and usually can handle heat better. Paul39 is correct that if you run the motor too slowly you can overheat it. When I worked for an OEM that used large motors and VFDs (from small to 400hp) we used to configure them to run no slower than 20hz (usually a setting in the VFD parameter list like- MinHZ). On a 1740 RPM motor this would give you a minimum speed of 580 rpm. For a 3450 rpm motor minimum speed would then be 1150.
This keeps the fan running over the windings.Carlos. Take the base speed of the motor (on the motor nameplate) multiply it by the Hz you are telling the drive to output and then divide that by the Hz marked on the motor nameplate. Example:If the motor nameplate lists the motor RPM at 1750 at 60 Hz and you want to run the motor at 42hz you would have(1750. 42) / 60 = 1225 RPM.To convert that to blade speed you would then have to take the ratio of your pulleys from the motor to the saw to get how fast the drive wheel of your saw is running. So if your motor output pulley was 2' and the drive pulley on the saw was 6' you would have 2 divided by 6, or 1/3 of the motor rpms. In this example using these pulleys the saw wheel would run at 1225 rpm/3 or 408 rpm.To convert that to feet per minute take the diameter of your saw wheel and multiply it by 3.14 to get the circumference of the wheel in inches multiply that by the rpm to get the number of inches traveled every minute and then divide that by 12 to get the feet per minute.Using a 20' wheel in this example would give you((20'. 3.14).
408rpm)/12 = 2135 fpmCarlos.
I can't see from the picture if that bandsaw has the adjustable guides,or those infernal pick off shims that you have to re stack whenever you put on a different blade. I think both are still offered,but the old fashioned adjustable ones might cost more. Early models were all adjustable.If it's American made,and you could get Carter guides for it,I'd say go. You need to be careful that it will accept Carter guides,though.
I'm not sure about the pick off guides,and if they take Carter replacements.At the museum,the furniture conservation shop carelessly bought the Delta with the pick off guides. It looked like a pain to adjust,especially those under the table.
Rockwell Vertical Band Saw
A truly bad offering by delta to save a few bucks.Last edited by george wilson; at 8:24 PM. First I think the 28-3X0 was the wood cutting variety and the 28-3X5 was the metal cutting but not 100% sure. As George said the J plate guide system is a real pain and though I did not see the 28-3X0 listed on the Carter site I have seen them on this type of saw but not sure how much fab work the owner did or if they do have an off the shelf solution. Everyone I have known with one likes the saw except for the guide issues.Bruce, OWWM is now Vintagemachinery.org though OWWM.com is still a working redirection link.
Thanks all.yeah, it looks like there are other wood tools in the background so maybe it is the standard for wood. Still waiting to hear from the owner. Any other input if this is the wood only model? Would it be better than most of the new sub $1000 band saws out there?It would be far superior to the current crop of import machinery. My 20 inch Delta bandsaw is slightly older than the one pictured.
The cast iron table trunnion is massive when compared to more recent offerings. The table itself is very heavy.
The whole machine weighs between 600 and 700 lbs. If the machine is in good shape, no cracked castings, good wheels, go buy it!
Delta 28 216 Manual
Was shopping at a local woodworking store and their current offering of 18 inch saws seemed very wimpy when compaired to my old Delta Raokwell. Thanks again. Are the parts readily available for something like this? Yeah my problem with looking at today's model and something like this saw is I've never seen anything but this newer stuff so I don't know what more this saw would give me.Assuming there are no defective structural parts, the only other parts that possibly need replacements are Bearings, Wheel tires, electric switches, all readily available. Find someone in your area who has an older model American made bandsaw and then comparable it to the lower priced imports.