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Author Topic: Delta 18" Radial Arm Saw  (Read 3389 times)

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Offline 21incher

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Re: Delta 18" Radial Arm Saw
« Reply #40 on: February 13, 2018, 05:26:38 PM »
That is scary.  Was the blade guard in place?  :)
Hudson HFE-21 on a custom trailer, Deere 4100, Kubota BX 2360, Echo CS590 & CS310, home built wood splitter, home built log arch, and a logrite cant hook.

Offline sawguy21

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Re: Delta 18" Radial Arm Saw
« Reply #41 on: February 13, 2018, 07:39:11 PM »
That was my first question. My dad had an RAS for years, no mishaps but we were well aware of the damage it could cause if improperly used.
old age and treachery will always overcome youth and enthusiasm

Offline SlowJoeCrow

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Re: Delta 18" Radial Arm Saw
« Reply #42 on: February 13, 2018, 09:58:18 PM »
Thanks for the replies everyone.  I haven't decided what I'm going to do with this saw yet.  I'm no stranger to RASs, used several different kinds over the years.  The blade guard was not on when the blade came off, that was my fault.  I will fix the motor at least to get it up and running again.

Offline Kbeitz

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Re: Delta 18" Radial Arm Saw
« Reply #43 on: February 14, 2018, 03:29:51 AM »
I think if it was my saw and I had the room that I would drill a hole at the end of the arbor and put a cotter pin.
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Offline SlowJoeCrow

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Re: Delta 18" Radial Arm Saw
« Reply #44 on: February 14, 2018, 08:58:40 AM »
Good idea K, I like it.  This saw is pristine, it's not wore out, just sat around for a while before I bought it.  I dont think I will get rid of it unless I can find a bigger 3 hp unit down the road.

Offline Brian_Weekley

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Re: Delta 18" Radial Arm Saw
« Reply #45 on: February 14, 2018, 01:17:06 PM »
My radial arm saws are DeWalts--not Deltas so I'm not very familiar with your model.  However, the motor doesn't look right to me--is it original or was it replaced (that fancy aluminum around the capacitors doesn't look like something you'd find on a vintage RAS motor)?  Radial arm saws should have left-handed threads on the arbor.  If someone replaced the motor with one that has right-handed threads, that might explain why the nut spun off.  Does the arbor still freely turn?  What exactly was happening when the blade came off--was it right after startup, was the motor just sitting there running with the blade spinning, or was it under load?
e aho laula

Offline SlowJoeCrow

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Re: Delta 18" Radial Arm Saw
« Reply #46 on: February 15, 2018, 09:59:57 AM »
Everything on this saw including the motor is stock, it's all original.  Don't know the year it was made, but probably in the 1990's or 2000's so it's not what I would call vintage. It's a relatively new RAS. Here's a picture of the cover for the capacitor housing.  I will have to double check the threads, but I am pretty sure that they are left-handed.





The arbor still turns freely, like nothing happened.  Here is what happened:  I fired up the saw and made a few cuts without any issue.  The saw was running under no load while I was preparing for the next cut and I heard a different sound like a new vibration coming from the machine.  Before I could even shut it off to see what was going on, the nut backed out and the blade dropped off.  I powered down asap after recovering from the blade hitting me.  After changing my pants and thanking God, I started the motor up with no blade on it to see if I could figure out what happened.  It spun up and that's when the capacitor started smoking.  Of course I shut it down asap.  So I don't know if the capacitor failed before or after the accident.

Now to help understand, I have the saw set up a little out of the ordinary.  The blade is tilted roughly 58 degrees from vertical and it is quite a bit higher than the table.  Here is a picture of the motor tilted. 





I bought this saw last year and used it a good bit set up just like this with no issues.  This was the first time I had used the saw for several months. 

With that angle, that's how the blade came off so fast, gravity was pulling it down with no nut to hold it in place.  The reason for the odd setup is that I use this saw to put points on wood stakes that I make.  I made a jig to hold the stakes and line them up 10 stakes at a time.  Cut a taper on one side of the row of stakes, flip them over and cut the other taper.  Here is a picture of the jig with stakes on it.  One side has already been cut, the stack flipped over and ready to cut the other taper off the bottom.





Note in this picture the motor is NOT tilted like it would be when cutting the taper.  The taper is cut off the bottom of the stakes and then they are flipped over to cut the other taper. 

It works well and you can point a lot of stakes quickly as long as your blade stays on the machine!

Offline Kbeitz

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Re: Delta 18" Radial Arm Saw
« Reply #47 on: February 15, 2018, 01:00:18 PM »
I can't tell from the pictures but if that motor has brushes and the capacitor shorted
to the run windings it could have worked as regenerative braking and that
would make a left hand nut come off.
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Offline jsmcauley

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Re: Delta 18" Radial Arm Saw
« Reply #48 on: February 20, 2018, 01:16:56 PM »
I don't know if your Delta uses a potential relay or a centrifugal switch, but I would thoroughly inspect the start circuit on that motor. Something caused the motor to stop suddenly and spin off the blade. Please let us know what you find.

Scott. 

Offline SlowJoeCrow

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Re: Delta 18" Radial Arm Saw
« Reply #49 on: February 20, 2018, 06:52:54 PM »
I believe it has a relay to switch the start capacitor off, not a centrifugal switch but I am not an electrician or motor expert.  That being said, I am going to take the motor in to a shop and have a professional look at it and fix it up right.  I will update this post with what they find but I can't take it in until next week since I will be out of town the rest of this week.

Oh I did double check the arbor, it does have left hand threads.

Offline Kbeitz

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Re: Delta 18" Radial Arm Saw
« Reply #50 on: February 20, 2018, 07:41:22 PM »
I do remember being able to buy a timed relay for motors when you could not buy replacement points for them anymore. I don't know if you can still buy them since current relays came out.
Collector and builder of many things.
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