I would probably stick some adhesive backe sandpaper onto a 1/2” diameter dowel.

Leave about 6” of bare dowel at each end.  The bare dowel will not cut and will act as a guide for a consistent angle.  A few quick swipes should do the trick.

No equipment purchase required.

Note: This works perfectly in my mind, but I have not tried it.

I would probably stick some adhesive backe sandpaper onto a 1/2” diameter dowel.

Leave about 6” of bare dowel at each end.  The bare dowel will not cut and will act as a guide for a consistent angle.  A few quick swipes should do the trick.

No equipment purchase required.

Note: This works perfectly in my mind, but I have not tried it.

There are some dogs on the market that need to have a UNIFORM chamfer at the top of the hole to function properly. The chamfer also needs to be a substantial depth. Enter chamfer tool.

The chamfer only tool that tsmi243 mentioned is for MDF only…not to be used in ply.

I've made several cutting stations/benchtops with the Parf Guide system (Mk II) over the past few years. Recently I got the reamer tool (before they offered a combo reamer/chamfer tool). The reamer on it's own is fantastic to refresh the holes. My benchdogs were so tight I could barely (or not at all) get them out. Then if a hole gets boogered at all from a clamp, then it wouldn't fit at all. I keep the reamer on hand in my drill when at the bench. I've never had a problem with it opening up the holes and losing accuracy.

The chamfer tool, on the other hand, is not necessary. If you used that to make all the chamfers you would have the worst case of carpel tunnel ever. I use a router with a chamfer bit. Test the depth with a bench dog until it is right. Works much faster and saves your hands to boot.

I have one as well. Don't think a few turns to cut the chamfer is going to enlarge the hole. If it slips in a new dog hole it's not going to cut the sides.

Good to do that. I have the chamfer/reamer. No way was I going to manually twist hundreds of holes. I almost went router, but the reamer sold me for removing glue etc.

I'm in the US. Lack of inventory at the time at TSO made me order from Axminster. Ended up with all sorts of good things.

I have a couple of old MFT1080s and I keep them clean of glue and such, so I have no need to enlarge the holes.  In fact, I find dogs to be a bit loose fitting, so I've never used them with accuracy in mind.  All that said, I'm just getting into UJK Expanding Dogs and Close Fit Dogs, thus the interest in the Chamfer Tool.  I just want to make sure that I don't make the holes any looser than they already are.  Too bad they didn't make a tool that would chamfer with your drill, but not ream.

I have one that I stopped using, it's too much trouble other than for the odd hole every now and then. I don't think it opens up the holes however, it's a slip fit and only needs to be rotated 1-2 times.

Xmas before last I bought one of Ryobi's battery/charger deals ($99 using a $100 gift card, so net cost to me was sales tax-$1) and got a "free" palm router that is now dedicated to a chamfer bit. It's amazing how often something "needs" a chamfer when it only takes a minute to do. All my dog holes get the Ryobi treatment now.

As @Cheese stated, many dogs now require it to work properly. I've found that style of dog is less susceptible to needing a perfect fit since the chamfer acts to self-center them.

RMW

@RMW  -
Richard, your approach with a dedicated router has served us well in our shop. Your observation that the chamfer Collar on the Dog aids in centering has also been borne out in our own shop experience.

Last but not least our customer service records support that these features get the job done for large number of our woodworker cutomers. If there is something that we should emphasize or play down on our website regarding Chamfers to make it more helpful, do let us know, please.

Hans

Quote from: Richard/RMW on February 06, 2023, 07:11 PM

I have one that I stopped using, it's too much trouble other than for the odd hole every now and then. I don't think it opens up the holes however, it's a slip fit and only needs to be rotated 1-2 times.

Xmas before last I bought one of Ryobi's battery/charger deals ($99 using a $100 gift card, so net cost to me was sales tax-$1) and got a "free" palm router that is now dedicated to a chamfer bit. It's amazing how often something "needs" a chamfer when it only takes a minute to do. All my dog holes get the Ryobi treatment now.

As @Cheese stated, many dogs now require it to work properly. I've found that style of dog is less susceptible to needing a perfect fit since the chamfer acts to self-center them.

RMW

@RMW  -
Richard, your approach with a dedicated router has served us well in our shop. Your observation that the chamfer Collar on the Dog aids in centering has also been borne out in our own shop experience.

Last but not least our customer service records support that these features get the job done for large number of our woodworker cutomers. If there is something that we should emphasize or play down on our website regarding Chamfers to make it more helpful, do let us know, please.

Hans

Hans, when do you expect the UJK Reamer/Chamferer to be back in stock?

Quote from: darita on February 07, 2023, 09:27 AM

Too bad they didn't make a tool that would chamfer with your drill, but not ream.

You can always make your own...

I made this tool after seeing your original post and it has worked very well for me.  Thanks for the detailed description of how you did it.