Trunion pivot bolt sheered

dusty · Post by **dusty** » Mon Mar 12, 2012 5:30 pm

beeg wrote:Dusty, that almost looks like the one from the bottom of my lower saw guard.

I don't have a 500 but I'll check the lower saw guard for my 510.

dusty · Post by **dusty** » Mon Mar 12, 2012 5:31 pm

blazerbob wrote:Those look like the pins that screw onto the top of the drum/shaper insert.

That may be. I do have that insert but I never use it (don't do much shaper work).

dusty · Post by **dusty** » Mon Mar 12, 2012 5:32 pm

blazerbob wrote:Those look like the pins that screw onto the top of the drum/shaper insert.

That may be. I do have that insert but I never use it (don't do much shaper work).

Thanks, they do fit.

blazerbob · Post by **blazerbob** » Mon Mar 12, 2012 6:00 pm

A picture of the pins used in the table insert is shown in the URL address below:

http://www.shopsmith.com/ownersite/cata ... insert.htm

dusty · Post by **dusty** » Mon Mar 12, 2012 6:28 pm

blazerbob wrote:A picture of the pins used in the table insert is shown in the URL address below:

www.shopsmith.com/ownersite/catalog/ms_shapertableinsert.htm

That mystery appears to be solved. Thanks.

reible · Post by **reible** » Mon Mar 12, 2012 6:37 pm

I too wonder how one shears one of these. That would take a lot of force!

Dusty those pins that are from the shaper inset to look a lot like the pivot pins on a shopsmith 500 table as you can sort of see from this image. (This is an ebay purchase that needs some clean up.)

[ATTACH]16673[/ATTACH]

Here are two not so clear shots of the pivots on the 520. First is from the "free" side and the second from the "fixed" side.

[ATTACH]16674[/ATTACH]

[ATTACH]16675[/ATTACH]

I have never had this table apart, it came with the correct parts so no removal or drilling was needed of the trunnion.

Some years back Jan was super helpful in finding me a fastener for the miter gauge, they have changed from a fine thread to a course at some time in the past (kept the same part number so while they shipped me the current correct part it was not interchangeable with the old part by the same number) With the strange head design/shape they used I was picturing me doing some grinding.... She went out in to the shop and dug in some bins and actually found one for me!!! Super service! Don't know if they would have the time now for this sort of thing.

Ed

dusty · Post by **dusty** » Mon Mar 12, 2012 6:54 pm

reible wrote:I too wonder how one shears one of these. That would take a lot of force!

Dusty those pins that are from the shaper inset to look a lot like the pivot pins on a shopsmith 500 table as you can sort of see from this image. (This is an ebay purchase that needs some clean up.)

[ATTACH]16673[/ATTACH]

Here are two not so clear shots of the pivots on the 520. First is from the "free" side and the second from the "fixed" side.

[ATTACH]16674[/ATTACH]

[ATTACH]16675[/ATTACH]

I have never had this table apart, it came with the correct parts so no removal or drilling was needed of the trunnion.

Some years back Jan was super helpful in finding me a fastener for the miter gauge, they have changed from a fine thread to a course at some time in the past (kept the same part number so while they shipped me the current correct part it was not interchangeable with the old part by the same number) With the strange head design/shape they used I was picturing me doing some grinding.... She went out in to the shop and dug in some bins and actually found one for me!!! Super service! Don't know if they would have the time now for this sort of thing.

Ed

Are you reporting that this rear trunnion has the larger holes?

reible · Post by **reible** » Mon Mar 12, 2012 7:17 pm

dusty wrote:Are you reporting that this rear trunnion has the larger holes?

Sure does!

This was the first "factory aligned" piece of gear that I got from shopsmith as my 500 to 520 upgrade.

When I did my 510 to 520 upgrade not long after was my first experience with the defective trunnion part. It took a lot of effort to set it up for the first time. Later when I needed to do a realignment on the first machine it was so much easier. Figured something was wrong with the second one but had no idea what. Even after I found out I did nothing for a while.

I opted to re-drill rather then send in the part and have to wait for the free replacement. I have since had a much better time with it.

The 510 top was less then wonderful so I got a used replacement in much better shape. I have it put back together but not adjusted or aligned, get to do that this summer, I'll also check those pivot pins while I'm at it since this thread has peaked my interest.

Ed

bduemig · Post by **bduemig** » Mon Mar 12, 2012 7:37 pm

Quoted by Dusty
"I too wonder how one shears one of these. That would take a lot of force!"

I don't beleive I ever would have done anything to cause such a shear, unless the movers loaded it improperly. I am wondering if the pin itself had a flaw that cause it to shear.

pennview · Post by **pennview** » Mon Mar 12, 2012 7:51 pm

Dusty, those pins you have fit the shaper insert (as you have learned) and are used as starter pins for pivoting a piece of stock into a shaper cutter or router bit. They allow you to safely start shaping or routing stock when working freehand without a fence. You place the stock against the pin and then rotate it into the cutter and then proceed with cutting. Once you begin the cutting you no longer need to keep the stock against the pin. Without the pin, the cutter may grab the workpiece (and you).