Design principles of Qwas Dogs

[Picktool]

[member=2022]Qwas[/member]

Steve, tried several times today but can't get your video to load.  I'm clicking on the arrow to initiate the video and get a gray screen with snow and a loading error.

Any help would be appreciated.

Don

Don,
try viewing in Chrome browser. I get the same thing in Firefox so I goto Chrome to view.
Helps especially when Im logged into youtube/gmail.

View youtube link

 

[Qwas]

Steve, tried several times today but can't get your video to load.  I'm clicking on the arrow to initiate the video and get a gray screen with snow and a loading error.

Any help would be appreciated.

Don

Google has been experimenting with new video players, especially with Apple products.

Try going directly to YouTube and search for "What Makes Qwas Dogs Different". You can also search for user "Steve Adams" and then find it under my list of videos.

 

[DrD]

[member=31307]Picktool[/member]
[member=2022]Qwas[/member]

Thanks Gentlemen - works fine with Chrome.  Not quite sure how it's related but I was in Edge, and I've got nothing but trouble of every sort since installing Edge.  Chrome - which may be related, I don't know - worked beautifully.  So, Picktool, thanks for the heads-up.  Qwas thanks for the informative video (I knew I'd learn something).  And, like Birddog, I've been, am and will continue to be a VERY satisfied Qwas Dog user.

Don

 

[Picktool]

heh... i thought I typed the link only to Youtube and it showed up
as the same vid as steves post instead of a text link.  [blink]

 

[Qwas]

No, you missed the point entirely. My dogs do not depend on the shaft. They fit like the balls, and that makes them centered on the hole.

Actually, if your dogs were a tight enough fit to seat in all directions, how is that any better than seating in just direction? It would be the same but not any better. You're also wrong in your example. If the holes has a nick (it would actually be much bigger than a nick as you describe it) large enough to affect a loose fitting dog than your tight fitting dogs would no longer fit tight. You can experiment with it for yourself.

 

[Bohdan]

No, you missed the point entirely. My dogs do not depend on the shaft. They fit like the balls, and that makes them centered on the hole.

[member=2022]Qwas[/member]
Does that mean that the shaft of your dogs is slightly tapered to allow for the slight differences in the various hole diameters?

 

[Qwas]

Yes, but the taper is associated with the head of the dog, not the shaft.

 

[Bohdan]

Yes, but the taper is associated with the head of the dog, not the shaft.

[member=2022]Qwas[/member]
If it is a shallow taper on the head then that would require you to clamp the dog down hard to enable the shoulder to centre the hole without moving once you put side pressure on it.

 

[Qwas]

I guess that depends on which direction you consider shallow? If the shaft slowly increases in diameter, then it acts like a wedge and doesn't require clamping. If the taper is very short in length on the shaft, and rapidly changes to the head diameter then it will need clamping. My dogs have been out there for 7 years and I've not had a customer say it needs  clamping.  [smile] So I would say I have it right.

 

[Qwas]

The reason for the design was because these dogs came out before the MFT/3. The older MFT-1080/800 has hole sizes that changed every production year. So I had to come up with a design that worked on all the different size holes or custom make dogs for each table. This last option wasn't very good because many customers didn't have any way to accurately measure the holes. So the design came from necessity.

EDIT> due to thread split

 

[Holmz]

Does this all imply that the spherical-headed dogs need to be held down with the screw hole feature on the bottom in order to register correctly at the top and not rock?

 

[Qwas]

No, there is no need to hold them with a screw and that feature is not on my Qwas Dogs.

 

[Holmz]

Then how will they not rock to differing degrees with differing diameter holes?
If they were spheres they would need to be held down.

 

[Qwas]

The 3 balls in the video did not rock and stayed in the holes just fine. You can try it yourself with any small ball or large marble. Qwas Dogs do not have a spherical head. You can go to my website and see them. The link is in my signature on this post.

 

[Birdhunter]

I guess I got lost somewhere in this discussion. I watched the video and it was clear to me that the spheres and the bolts were used to demonstrate a principle and not as a product. I thought the demo was clever.

I think it's a good thing that there is competition in the marketplace, even for bench dogs. It drives manufacturers to develop better products.

Sometimes, great new ideas come out of absurd beginnings.

 

[peterboy]

I don't understand the whole video, it's quite possible I'm thick but I think the principal is a sphere will self centre in any hole as long as the hole is of a smaller diameter than the sphere is that right.   

 

[Scorpion]

I don't understand the whole video, it's quite possible I'm thick but I think the principal is a sphere will self centre in any hole as long as the hole is of a smaller diameter than the sphere is that right. 

I don't think your thick, I think we're all attempting  to understand something that has been over complicated.  I could probably make some doodle art and explain his point but that would be more silly than us watching the first attempt.

The simple version - there are a few companies that sell dogs for your MFT.  Some cost more, some cost less.  If you have a lathe, you can make your own.  There's no real science behind it and there's not much difference between the brands though they want you to believe there is. 

I spent less than a hour making something useful and more than an hour arguing with an Internet stranger about something useless.  Now I'm wishing I'd done neither.

 

[peterboy]

I don't think your thick, I think we're all attempting  to understand something that has been over complicated. 

Thanks for the vote of confidence, I'm glad it isn't just me. The bit I'm struggling to come to terms with is what does the self centring affect the spheres posses have to do with the parallel shank dogs which only translate the hole edge. I'm not totally new to machining, I have a Colchester here and can hold a couple of tenths over a short part like a dog.I must be missing something.   

 

[Bohdan]

What [member=2022]Qwas[/member] was saying is that his dogs have a taper on the shoulder of the head so that like a ball they would self centre in a hole.

I prefer to have my dogs snug in the holes so I just make my own to fit my MFT perfectly.

 

[Ivanhoe]

I like my Qwas dogs - Steve made some to adapt to my Mafell rail on my MFT Franken table.

EDIT> due to thread split