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Author Topic: Delta 18" Radial Arm Saw  (Read 1816 times)

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Online SlowJoeCrow

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Delta 18" Radial Arm Saw
« on: March 15, 2017, 04:43:04 pm »
I am considering buying a large Delta radial arm saw, but I am not an electrical whiz and I can't tell if the motor is 3 phase or not.  This is a Delta International 33-420 that was originally bought new in the 1990's and used until 2004 and it has just been sitting in a warehouse since.  Upon inspection, I couldn't find a motor plate with the specs - looking online at similar vintage machines, it appears the motor tag was just a decal so it could have peeled off.  After more internet research, it also appears that this model saw was available with different motors, both 3 phase and single phase.  The data decal on the lower saw frame indicates that it is 3 phase, but the fellow selling it says he's pretty sure it was single phase since they didn't have 3 phase power at the time the saw was purchased.  He is an employee of the larger company that owned it and isn't certain.  How can I tell what kind of motor this sucker has???  Anybody knowledgeable about these saws or what to look for to tell? I was ill-equipped at the time that I looked at it and will likely go back and open up the motor top plate for more inspection.  Here is the data plate that is one the lower frame of the saw.


Thoughts anyone?

Offline 21incher

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Re: Delta 18" Radial Arm Saw
« Reply #1 on: March 15, 2017, 04:53:25 pm »
It says 3 phase on the sticker. Check the number of wires to be sure ( there will be 3 hots). You should be able to run it on single phase with a VFD or phase converter.  :)
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Offline Darrel

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Re: Delta 18" Radial Arm Saw
« Reply #2 on: March 15, 2017, 05:18:40 pm »
Hear is a link that goes into detail as to how to build a rotary phase converter. It is way easier than most people believe

http://www.metalwebnews.com/howto/ph-conv/ph-conv.html
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Re: Delta 18" Radial Arm Saw
« Reply #3 on: March 15, 2017, 06:11:05 pm »
I will be going back tomorrow to open the motor cover to look at the wires.  They were pretty adament that it was single phase despite the label shown above.

Offline Dave Shepard

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Re: Delta 18" Radial Arm Saw
« Reply #4 on: March 15, 2017, 06:29:42 pm »
That O with a slash through it means phase, in this case three phase. Could the motor have been replaced with a single phase one?
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Re: Delta 18" Radial Arm Saw
« Reply #5 on: March 15, 2017, 09:07:20 pm »
That what I was wondering.   They said they bought it new though so they would have had it equipped for whatever electrical service they had at the time.
We shall see tomorrow.   I'm hoping it is the 5 hp single phase on the machine.

Offline Larry

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Re: Delta 18" Radial Arm Saw
« Reply #6 on: March 15, 2017, 10:24:30 pm »
The label say's its a 3 phase motor so I suspect its 3 phase.  It can become tricky.  In the picture is a 14 Delta bandsaw that has a 3 phase motor that I run on single phase.  Inside the box is a small capacitor and relay that starts the motor.  Its called a static phase converter.  Most folks assume the bandsaw is single phase.

I built that static converter, but I never would run a 5 HP saw with one, especially if I was working it hard.  I also build rotary phase converters which work well and have a whole flock of VFD's in the shop.  VFD's to run 5 HP are expensive.

And remember....Real Machines are three phase. :)

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Offline opticsguy

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Re: Delta 18" Radial Arm Saw
« Reply #7 on: March 16, 2017, 11:28:09 am »
18" radial arm saw?  Never knew they made such an item, I want one!!!!!!!!!!!!!!!!
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Offline WV Sawmiller

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Re: Delta 18" Radial Arm Saw
« Reply #8 on: March 16, 2017, 01:03:54 pm »
18" radial arm saw?  Never knew they made such an item, I want one!!!!!!!!!!!!!!!!
X2.

   I just got a 10" radial arm saw last year, built a stand/table for it in the end of my lumber shed and I don't know how I ever got along without it. I see I now salvage a lot more short lumber and such that I used to throw in the scrap pile. My next tool to use more is my planer.
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Offline Brian_Weekley

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Re: Delta 18" Radial Arm Saw
« Reply #9 on: March 16, 2017, 02:51:27 pm »
Any chance it already has a phase converter on it but they didn't realize what it was?

Make sure you wear your big boy pants to move that thing!  Radial arm saws are cool!

BTW, this is a fascinating WWII era film showing large scale use of DeWalt radial arm saws to build barracks.  The versatility of these saws are amazing...



e aho laula

Offline Dave Shepard

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Re: Delta 18" Radial Arm Saw
« Reply #10 on: March 16, 2017, 07:15:26 pm »
The scale of those projects is amazing. I'm doing good just to make a few tomato stakes in an hour. :D
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Offline Brian_Weekley

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Re: Delta 18" Radial Arm Saw
« Reply #11 on: March 16, 2017, 07:40:54 pm »
I'm doing good just to make a few tomato stakes in an hour. :D

Did you see them making tomato stakes at 13:15 in that video?   :D

And check out the dado blade at 21:15!
e aho laula

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Re: Delta 18" Radial Arm Saw
« Reply #12 on: March 16, 2017, 08:12:05 pm »
Well to give an update, I returned for more investigation... it is in fact a single phase motor - there are  two capacitors in the box on top of the motor.  From the research that I have done, the 33-420 was a 5hp single phase.  The 33-421 was a 7.5hp 3 phase.  I have no idea why the model plate indicates it is three phase,  the motor is definitely single phase, and looks completely stock as far as I can tell.  I will post some photos if I can.

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Re: Delta 18" Radial Arm Saw
« Reply #13 on: March 16, 2017, 08:54:47 pm »
Wow that video is awesome!!  BTW, cutting points on stakes is exactly why I want one of these larger radial arm saws, even though I have never seen this video before.  Nice to know my thought process isn't way off!  I want to be able to tip entire boards and then rip them into stakes.  The saw that I'm looking at is in rough shape though and I'm having second thoughts.   I have no way of seeing it run before purchasing and I don't know what condition the motor is in.

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Re: Delta 18" Radial Arm Saw
« Reply #14 on: March 16, 2017, 09:15:05 pm »
Here are some pictures of the beast:



The last picture shows the motor capacitors.   It is in rough shape with the stock legs missing, the brass Arbor nut stripped out and most pivot points are seized up.

Offline Larry

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Re: Delta 18" Radial Arm Saw
« Reply #15 on: March 16, 2017, 09:29:28 pm »
In that condition its hardly worth scrap value.  Usually the motors are good and at most would require new bearings which is simple.  The arm is the real problem.  I've never tore into a Delta but some of the Dewalt arms can be re-done at great expense.

I've seen a lot of RAS's at industrial auctions that do good if they get a bid.  I have a 12" Delta and a 16" Dewalt in fair condition but lots better than that saw.  Think I have $100 in the two of them.

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Offline Darrel

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Re: Delta 18" Radial Arm Saw
« Reply #16 on: March 16, 2017, 10:04:30 pm »
A machine in that condition will be happier if you don't wake it up and make it go to work and so will you. I'd hold off 'till I found one in better condition. I know of no woodworking machine as versatile or dangerous as a RAS. that being said, use your head and you can stay quite safe.
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Offline Don P

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Re: Delta 18" Radial Arm Saw
« Reply #17 on: March 16, 2017, 10:38:03 pm »
I've used older versions of that saw in 3 ph, they are beasts, one followed me around to 2 different shops, couldn't get away from it  :D.
I was working in an expanding furniture company back in the day... Yes back in the day there were expanding furniture companies. They had about 30 12" DeWalt radial arms that I helped switch out to whirlwind chop saws. The problem with most was that the arm is a casting with grooves machined in it that the motor carriage bearings run in. Those grooves were pretty heavily worn on most of the saws in the first 6" or so where they did most of their work and bouncing. The Craftsman's had a half round strip of replaceable steel and bearings with a concave rather than convex outer profile performing the same function on their saws. I agree a radial arm is probably the most versatile and dangerous tool in the shop.

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Re: Delta 18" Radial Arm Saw
« Reply #18 on: March 16, 2017, 10:53:56 pm »
The arm and slider are in good shape, just needs cleaned and relubed.  This Delta has four roller bearings that ride on four hardened rods held in the cast arm.  If these wear, all you have to do is rotate the rods.  I'm sure I could loosen up the pivot points as well, I'm more worried about the motor being junk.  I am leaning away from it since I would have to spend a good amount of time to get it up and running and my time is at a premium.  He is asking $400.  Still, it's not everyday I come across a single phase 18" RAS......hmmmm....

Offline 21incher

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Re: Delta 18" Radial Arm Saw
« Reply #19 on: March 17, 2017, 08:32:58 am »
Good luck if you purchase it. For $400.00 I would have to hear the motor running. I bet it will cost another $400.00 for a good blade with the proper hook angle for it. That saw would put fear in my heart after seeing my 10 inch kick out a strip of wood that shattered when it hit the concrete wall. :) 
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Offline Don P

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Re: Delta 18" Radial Arm Saw
« Reply #20 on: March 17, 2017, 08:52:36 am »
It's in a shop with lights? Roll it over to the panel and wire it into a breaker for a trial run. The black capacitor looks like a start, the metal cap a run.

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Re: Delta 18" Radial Arm Saw
« Reply #21 on: March 17, 2017, 10:32:41 am »
I watched that video yesterday and those saws are awesome.  I want that 24"er.

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Re: Delta 18" Radial Arm Saw
« Reply #22 on: March 18, 2017, 07:26:33 am »
Well I don't have to worry about whether I should buy it...somebody else bought it and I am OK with that.

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Re: Delta 18" Radial Arm Saw
« Reply #23 on: March 18, 2017, 07:03:30 pm »
Just remember that a radial arm saw takes a zero pitch blade.
Try something different and you might be laying on the floor.
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Re: Delta 18" Radial Arm Saw
« Reply #24 on: March 18, 2017, 09:15:45 pm »
Yes sir, zero or negative 5.  That is what I used in my Crapsman 10" RAS before I sold it.  It's funny, I went from RAS to SCMS and now I am looking to to back.

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Re: Delta 18" Radial Arm Saw
« Reply #25 on: March 19, 2017, 12:53:59 am »
Happy birthday SlowJoeCrow!
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Re: Delta 18" Radial Arm Saw
« Reply #26 on: March 19, 2017, 08:55:07 pm »
I saw a 14 inch delta  RA   for $125.00 on a woodworking forum, I can't remember witch one now but , arm saws are for sale everywhere and cheap,  If it were me, I'd shop around before paying 400 for it.   If you don't absolutely have to have an 18 inch RA, you might do well to shop around and find a 16,14,or 12 inch saw in good working order that's single phase.    Plug and play !! ???
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Re: Delta 18" Radial Arm Saw
« Reply #27 on: March 20, 2017, 07:40:52 am »
Yep, I don't need a 18".  Ideally I want a 14" with a single phase motor.  I'm sure I will find one, just a matter of time.  I was bidding on an older Delta Multiplex 40-B a couple of weeks ago that would have been perfect, but I let it slip away on accident...whoops!

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Re: Delta 18" Radial Arm Saw
« Reply #28 on: May 31, 2017, 10:53:28 am »
Well, I went smaller, quite a bit smaller.  I just picked up a Delta 12" radial arm saw, a 33-890.  I think it will work for want I want to do with it.  It has the 2 hp 230v motor.  This saw was bought by a lady on recommendation of her live-in boyfriend at the time and then never used.  It might have cut wood like twice.  Maybe three times.  It has the factory delta blade on it (non-carbide teeth) which is still sharp.  The original mdf table and fence has NO SAW KERFS IN IT!

I am currently going through the adjustments and will post some pictures soon.  Eventually the table will need replaced as it is bowed from time but my immediate use for it isn't precision woodworking so I will let it go for a while.  I do have a proper new blade coming for it.  I am anxious to see the power difference between this saw and the 10" craftsmen that I used to own that claimed 2.5 hp (yeah right!)

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Re: Delta 18" Radial Arm Saw
« Reply #29 on: May 31, 2017, 01:24:05 pm »
That should be a good saw and will serve you well
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Re: Delta 18" Radial Arm Saw
« Reply #30 on: July 24, 2017, 10:04:56 pm »
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