Dewalt 770 radial arm saw - Woodworking Talk - Woodworkers Forum
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post #1 of 11 Old 04-30-2019, 03:12 PM Thread Starter
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Dewalt 770 radial arm saw

I inherited a 10" dewalt radial arm saw 770 (60 years old machine). One of the accessories is a drum sander t/r7468. I need instructions on how to load the sandpaper and if the drum sander needs a locking pin attachment which i do not have.


Any help or suggestion s would be greatly appreciated
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post #2 of 11 Old 04-30-2019, 05:14 PM
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Quote:
Originally Posted by NJJACK View Post
I inherited a 10" dewalt radial arm saw 770 (60 years old machine). One of the accessories is a drum sander t/r7468. I need instructions on how to load the sandpaper and if the drum sander needs a locking pin attachment which i do not have.


Any help or suggestion s would be greatly appreciated
You might post some pictures. Maybe one of us can come up with an idea. A lot of times with old equipment you end up having to fabricate parts.
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post #3 of 11 Old 04-30-2019, 05:32 PM
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Quote:
Originally Posted by NJJACK View Post
I inherited a 10" dewalt radial arm saw 770 (60 years old machine). One of the accessories is a drum sander t/r7468. I need instructions on how to load the sandpaper and if the drum sander needs a locking pin attachment which i do not have.


Any help or suggestion s would be greatly appreciated
Welcome to the forum, Jack! Add your location to your profile so it shows in the side panel. You can add your first name to your signature line and it will show in each post. And we do like photos so show us your shop, tools, projects, etc. whenever you get a chance.

I bought a DeWalt 7770 RAS in 1976, loved it, but lost it in the early 90's when the shop it was in had the roof collapse and destroyed my saw. I would love to have it back!

However, I also bought that drum sander and still have it.

See if this works for you -
Dewalt 770 radial arm saw-dewalt-drum-sander.jpg

Dewalt 770 radial arm saw-dewalt-drum-sander-instructions.jpg

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post #4 of 11 Old 05-01-2019, 12:55 PM Thread Starter
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Dewalt 770 radial arm saw

thank you


I have one more question: Where the instructions say "Then insert tube an turn with key" I do not understand what the tube is or am i missing a piece. Is the key the small piec on metal shape like an "L"?


I have attached pictures of my Dewalt drum sander.


Thank again for all your help.

Last edited by difalkner; 05-02-2019 at 11:08 AM. Reason: removed file links - they are not photos
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post #5 of 11 Old 05-01-2019, 01:27 PM
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Originally Posted by NJJACK View Post
thank you


I have one more question: Where the instructions say "Then insert tube an turn with key" I do not understand what the tube is or am i missing a piece. Is the key the small piece of metal shaped like an "L"?

I have attached pictures of my Dewalt drum sander.

Thank again for all your help.
Yes, the key is the 'L' shaped piece of metal. The tube is aluminum and easy to make. I made the small sander when I had access to a machine shop and the tube is probably 5/16" aluminum tubing that I flattened a bit in a vise.

Dewalt 770 radial arm saw-dewalt-drum-sander-key-tube.jpg

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post #6 of 11 Old 05-01-2019, 02:19 PM
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OK, a few more questions .....

The hole in the small drum appears to be round.
The aluminum tubing appears to be oval.
The key is also round and appears the it would fit inside the oval tubing.... however once inside it appears that it would just spin/rotate without any clamping effect?

I can understand if you rotate the oval inside a round hole it will touch at 2 points .... then what?


What am I missing? Thanks, David.

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
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post #7 of 11 Old 05-01-2019, 03:57 PM
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The key is flat and just fits into the flattened tube, the hole is round in the sander. When you put sandpaper on the drum with the ends of the sandpaper in the hole then the hole essentially becomes out of round. When you insert the flattened tube into the hole and rotate it with the key then the sandpaper is locked against the side of the hole by the tube and stays in place. It's really just an eccentric lock and works pretty good. In all the years I used mine I don't recall it ever slinging the paper off.

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post #8 of 11 Old 05-01-2019, 04:00 PM
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Quote:
Originally Posted by woodnthings View Post
The hole in the small drum appears to be round.
The aluminum tubing appears to be oval.
The key is also round and appears the it would fit inside the oval tubing.... however once inside it appears that it would just spin/rotate without any clamping effect?

I can understand if you rotate the oval inside a round hole it will touch at 2 points .... then what?


What am I missing? Thanks, David.
Appearances can sometimes be deceiving, look carefully at the key.
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post #9 of 11 Old 05-01-2019, 04:48 PM
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Appearances in the photos....

Quote:
Originally Posted by difalkner View Post
The key is flat and just fits into the flattened tube, the hole is round in the sander. When you put sandpaper on the drum with the ends of the sandpaper in the hole then the hole essentially becomes out of round. When you insert the flattened tube into the hole and rotate it with the key then the sandpaper is locked against the side of the hole by the tube and stays in place. It's really just an eccentric lock and works pretty good. In all the years I used mine I don't recall it ever slinging the paper off.

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Appearances can sometimes be deceiving, look carefully at the key.



If I could have determined the key was flat, I would not have asked my stupid question. I'm smart enough to know that if you turned the oval, it would bear against the wall of the hole and stated so. Even at this point, I still can't see that the key is flat .....and that's why I used the word "appears" ......

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)

Last edited by woodnthings; 05-01-2019 at 04:52 PM.
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post #10 of 11 Old 05-01-2019, 05:41 PM
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Originally Posted by woodnthings View Post
If I could have determined the key was flat, I would not have asked my stupid question. I'm smart enough to know that if you turned the oval, it would bear against the wall of the hole and stated so. Even at this point, I still can't see that the key is flat .....and that's why I used the word "appears" ......
I don't want to get it back out for another photo so I just cropped the one from before -
Dewalt 770 radial arm saw-dewalt-drum-sander-key.jpg

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post #11 of 11 Old 05-02-2019, 12:00 PM
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Harbor Freight sells a small plastic sanding drum set that I bought about a year ago. I like the idea of being able to use ordinary sandpaper of any type or grit instead of more expensive sanding sleeves with limited selection. It has the same sandpaper change mechanism as the radial arm drum sander pictured above, including the oval pin that holds the sandpaper in place. I have used a few of the Harbor Freight drum sanders, but rarely. They work fine, but I have low expectations for Harbor Freight tools.

The oval shape allows you to insert the pin without pinching the sandpaper. When you rotate the pin, it pinches the sandpaper against the hole wall and adds tension to snug the sandpaper around the drum. The slight "spring action" of the pin and friction are what hold the sandpaper in place. It is somewhat crude, but it works.

Here is the sanding drum set:

https://www.harborfreight.com/4-piec...set-35455.html

Photos:

* Package Label with Sanding Drum

* Sanding Drum Closeup - Shows oval pin in circular hole.

My instructions: Wrap sandpaper around the drum and insert the ends into the slot. Insert the pin most of the way into the hole without tearing the sandpaper, then twist it to tighten the sandpaper around the drum and lock it in place. Push the pin the rest of the way until fully inserted.
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ID:	374987  

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