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Discussion Starter #1
:moil:
I'm having trouble finding info for a router chuck interchange.

The armature spindle shaft that it needs to go on is 15/32 20 tpi. If I waited long enough, I could probably find an original on ebay. The original was on 1/4" chuck. I figure driving a 1/4" shaft with 3.2 HP... well, a 1/2" chuck capable of also doing 3/8" and 1/4" bits would make more sense.

Researching elsewhere, someone 3 years ago said that a Porter Cable chuck would work. Not told was what model of Porter Cable Router. It was not really confirmed if this really would work. I figured this would be the best place to ask.

I asked my local tool service center, who the owner tells me that he does not know.

I may be wrong, but as far as I can tell, there are two main Porter Cable chuck sizes (shaft mount wise)- model 1001 (and similar) and model 890 (and similar).

I now this might entail a user removing their chuck and measuring the threads. Anyone know the chuck thread sizes? Maybe of other brands/models that might work?

If all else fails, I guess I could buy a Poter Cable chuck and have a machine shop make me one the would go to my shaft, yet use porter cable collects and chuck nut... I'm thinking that that route would be spendy.
 

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Mike, let's start from the begining; what router do you need a collet and collet nut for?
 

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Discussion Starter #3
Mike, let's start from the begining; what router do you need a collet and collet nut for?
That's the problem. I'll tell you, but I've seen this slammed on this forum before.

I have several 1/2 inch routers, several 1/4 medium duty routers, 2 trim routers, 2 separate router tables... And this is not a router.

It is a Montgomery Wards Power-Kraft Radial Arm Saw with 2 auxiliary shafts. One shaft turns at 3240 for sanding, buffing and grinding. The other turns at 20,000 for routing and shaping. The thread on that shaft is 15/32 20 tpi.

There was a router adapter that used to sell for it (1/4/ shaft bits).

I used to use it as a RAS, drum and disk sander, buffer... I was given this as it didn't work. Rebuild it (brushes and bearings). I am now changing bearings again. So yes, it's had a whole lot of use. I have it tuned, as with the other tools I use.

I sue my router tables allot. I used my free-hand routers with lots of jigs I've built. Instead of building a tilt router lift for one of my tables, I am toying with more of a pin router / non-computerized CNC type of capabilties. I looked into the Maxis tooling system... Around $10,00 plus. (Ouch) As with all my jigs, I make do with what I can afford, giving me the ability to what I need and what to do. Retrofiring my RAS seems to be an answer.

Montgomery Wards has been out of business for 10+ years(?). I hear that Tool-Kraft had been selling some repair parts... but don't know about "options."

Still, that would limit me to 1/4" bits. Finding another chuck would give me the ability to use both my 1/4" and 1/2" bits.
 

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Ok, we need to get BJ(Bobj3) in on this thread. I believe he owns a saw like yours and may have more information. I will PM him.
 

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Discussion Starter #5
Ok, we need to get BJ(Bobj3) in on this thread. I believe he owns a saw like yours and may have more information. I will PM him.
Thanks Mike!
 

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I think that's probably 1/2" 20 tpi. Just sold a 1/4" adapter couple of months ago, never have seen a 1/2" adapter. But that doesn't mean that some one did not make one. Sears bought much of Wards repair parts, but that would have been an accessory, not a part I think! I can measure my pc 690 shaft if you like, but I am pretty sure it is over 1/2". Come to think it has to be to except a 1/2" bit!
 

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Just measured the PC690 collet nut is like 15/16! Did not mic it.. but it's not even close!

As I understand, those machines were made by Rockwell some 40 plus years ago! Might try some of the vintage machine parts places. Or off to the machine shop!
 

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Discussion Starter #8
15/16? Well that model is not going to work. Was at Home Depot yesterday and their PC 1001 looked about right, but I'm sure they wouldn't approve of taking their display apart to check the thread size... So I thought to ask here.
 

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Discussion Starter #9 (Edited)
As I understand, those machines were made by Rockwell some 40 plus years ago! Might try some of the vintage machine parts places. Or off to the machine shop!
Some say Rockwell. Also heard that about Sears on parts... "Vintage Machines" (.org) says Power-Kraft came from Tool-Kraft and that Tool-Kraft was supporting the RAS after Mongomery Wards closed. Other forums, members said they got parts from Tool-Kraft. That's been 10 or so years ago since MG closed. Last I heard was 3 years ago on parts. Don't know about now. Bearings, I've just been getting directly through a bearings/Seal supplier.

I toyed with the idea of putting a 1/2" 20 tpi chuck on and see if it worked, but if it came apart at 20,00 RPM... then those threads will be toast. (Let alone the shrapnel.)

I figured I'd ask. I figured I have three options.
- Find a chuck that has that thread size.
- Have a chuck machined that would connect to those threads and use someones collets and chuck nut.
- Machining a spindle extension to thread onto the shaft and provide other diameter/threads for a PC 890 styled chuck assembly.

Sound sensible?
 

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Discussion Starter #10 (Edited)
I think that's probably 1/2" 20 tpi. Just sold a 1/4" adapter couple of months ago, never have seen a 1/2" adapter. But that doesn't mean that some one did not make one. Sears bought much of Wards repair parts, but that would have been an accessory, not a part I think! I can measure my pc 690 shaft if you like, but I am pretty sure it is over 1/2". Come to think it has to be to except a 1/2" bit!
it's 15/32" 20tpi. Same shaft as armature. the other shaft that has the saw flange on one side and other end for grinding... is 1/2" 20tpi.

1/2 inch would be more probable than 15/32. (only 1/32 difference.) Seems to me a real odd size.

1/2" shaft to 1/2" bit? Paint you a picture. 1/2" shaft. around 1/2" minus about a 1/32 to 1/16 for threads as an inside diameter of the collar... then further down the collar is machined for the outside diameter of the collect. Could be any size on both ends as they are machined in different areas. It's possible. But is it likely?

I think if nothing else, collecting chuck sizes as data would help others to interchange chuck between brands/models. For instance to tell if a quick-change chuck will fit someones router.

Second picture is of PC 892.
 

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1/2" x20 is most likel;y what you have. It would be easy to check as that is a UNF thread (i.e. standard 1/2" fine thread). A hardware store nut would thread onto it without any slop. I have 2 Hitachis and a DeWalt and all 3 are metric. I'm not sure how far you would have to go back to find a collet with imperial threads.
 

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Discussion Starter #12
1/2" x20 is most likel;y what you have. It would be easy to check as that is a UNF thread (i.e. standard 1/2" fine thread). A hardware store nut would thread onto it without any slop. I have 2 Hitachis and a DeWalt and all 3 are metric. I'm not sure how far you would have to go back to find a collet with imperial threads.
I wish it was 1/2" 20tpi. That is the standard size of a jacobs drill chuck... And I have one already for the other output shaft. But, alas, screwing that chuck onto the 20,000 rpm shaft, it screws on. It is also loose and wobbly. It is definitely a fraction smaller than 1/2".

Here is from the original manual:
 

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Having any part of the spindle/adapter/collet less than 1/2' would defeat the whole reason for using a 1/2" bit in the first place. Yes you could use a machined adapter to a standard collet. That would be my recommendation.

Your picture proves my point that it was an accessory. They are not usually carried as repair parts. Can be, but not always.
 

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Discussion Starter #16
After looking at everyone's links and listening to everyone's recommendations-

I think my best route is to have a spindle adapter machined. Looking at exploded views of routers to see who actually uses a separate chuck, rather than the chuck being machined directly into the spindle, narrowed my choices on what to adapt to. After looking at chucks, collets, collet nuts, quick change chucks, OEM options, ability to use 1/2" through 1/4" inch collets, cost...

I think my preference will be adapt to a Porter Cable 890 series chuck. That should not end me up with any dead-ends on supported parts. It should handle 3.2 HP. It should give me the ability to use all my bits and let me start to play with shaper cutters.

So my current plan is to order a PC 892 chuck assembly and take it to my local machine shop, with the armature. I have it apart right now waiting on bearings... That should get me going and give me an extra inch of clearance to see what's going on.

Thanks to all. When done, I'll tell you if/how it worked.
 

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Did you solve the problem?

Hi: How did you eventually solve the collet problem? If you used the Porter Cable chuck, what size threads does it have?
Thanks, Mars
 

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I have the same Wards Powr Kraft RAS--two of them, actually. I keep one configured for cross-cutting/mitering, and the other for over-arm routing and disk sanding. I have the original collet accessory for the high-speed spindle, but have the same annoyance with being limited to 1/4" bits. I also assumed that I'd eventually have to have a 1/2" collet custom-machined. Would love to hear how you fared with a 1/2" collet!

Thanks.

Dimarc67
Frederick, MD
 

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Dimarc; Hey, welcome!

Mike, the OP hasn't posted a comment for several years (unless I missed something). He was living on the Olympic Peninsula, in Wash.
Changed careers and we haven't heard anything from him. Too bad because he was a very competent craftsman.
This thread started in 2012...last comment in 2014.
 

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I tried to pm Mike a couple of months ago and no response.
 
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