Rip Dogs Redux

[rmwarren]

After a bit of egging on (Tinker...) I am about ready to make another batch of the Rip Dogs. For anyone not familiar with them there is an old thread somewhere on the FOG but they are basically a set of dogs and clips that fit the MFT and let you make precise 90 and 45 degree cuts.

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To keep them straight I nick-named the various pieces the guide dogs (w/pin), rip dogs (no pin) and rip clips.

In addition to the original components shown above I have been toying with making 2 more parts, (1) a small bracket that attaches to the stock MFT guide fence and the guide dog and (2) an additional guide pin bracket that attaches to the MFT extrusion and gives more cutting capacity. The photos show the prototypes I have been using myself and the renderings show that latest designs for the actual parts.

MFT Guide Pin Brackets - the bracket is designed to fit the MFT but it will also work with 80/20 15 or 40 series extrusions and with Incra T-Track.

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Guide Fence Brackets - the handle tightens down & pulls the fence tight to the guide dog and then a rip dog can be used at the other end to align the fence. I also use the guide fence clamp that comes with the MFT/3 to secure to fence to the MFT for angled cuts.

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I am interested in any ideas or feedback anyone may have, particularly thoughts about the 2 new gizmos.

Thanks,

RMW

 

[suds]

MFT1080 compatable?

 

[rmwarren]

MFT1080 compatable?

Good question. Answer: I dunno... [unsure]

The dogs are, I believe, slightly tight. This is a known difference between 1080 and MFT/3, i.e. the holes on the 1080 are a few thousandths of an inch smaller. As I recall Alan has a set of the original dogs that he uses in 1080 and they fit but tightly. Alan - feel free to correct me on this.

The guide pin brackets for the MFT extrusion SHOULD work, the little tabs are sized at 8MM to fit into the slots of the MFT/8020/Incra:

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Assuming the slot on the 1080 is 8MM or larger they they would fit. If you don't mind checking I would appreciate confirming it.

Thanks,

RMW

 

[cvn72]

When will these be up for sale again?  If you buy the rip dogs, guide pin, and guide fence brackets as a group purchase will there be a discount over buying them individually?

 

[Dane]

I'm in.  Those brackets would be super useful, as would the fence clamps.  When are they going to be for sale?

 

[nanook]

what would you be wanting for the set?

 

[Alan m]

they were a bit tight on my mft but they work perfectly. just a bit hard to remove

im interested in completing the set

 

[rmwarren]

Production time will be about 4-5 weeks after I pull the trigger. Based on previous projects I will probably need to fiddle with them for another week or 2 before I am confident enough to finalize the design, so they should be available on the short side of 2 months.

Last time there were a limited # of sets as it was a first-time experiment. This time around I will order enough to make them available as sets or individual parts. No idea on cost yet.

If someone can check the width of the slot in the side of the MFT 1080 for me I would appreciate it. If a 5/16" or M8 bolt slips in then the tabs on the bracket will fit.

Thanks,

RMW 

PS - this is the original thread in case anyone is interested: Rip Dogs

 

[rustym]

Richard,
The slots in my 1080 measure .340 thousands or 8.65mm

Rusty

 

[rmwarren]

Richard,
The slots in my 1080 measure .340 thousands or 8.65mm

Rusty

Thanks Rusty!

RMW

 

[vwdave]

Put me down for a set.

Dave

 

[mhch]

I'll also consider to be a quite repeated customer for two of each new devices

 

[Sparktrician]

Count me in, too.

 

[Emer Construction]

I'm definitely in for another set.  I have your original rip dogs and haven't used the MFT since

 

[Rocky]

Count me in too.

 

[panelchat]

looks great, i'm very interested, probably in the basic set, without the mft units. (they look great but my needs are satisfied on that hole pattern)

 

[Sean KS]

Richard,

I'm inspired by the simplicity of your superior designs, it's really something to aspire too. Is there a simple solution to taking the guides off of the 90/45 grid. It seems the design is close to being able to replace the lacking miter gauge designs. I admire your work, I'm looking forward to seeing where you push it to.

 

[rmwarren]

Richard,

I'm inspired by the simplicity of your superior designs, it's really something to aspire too. Is there a simple solution to taking the guides off of the 90/45 grid. It seems the design is close to being able to replace the lacking miter gauge designs. I admire your work, I'm looking forward to seeing where you push it to.

Geeze Sean, you've got me blushing...  [smile]

I have been playing with a couple ideas for angled cuts, one fixed (15/22.5/30/45 degrees, etc) and one adjustable to any position. The former requires some math that I am struggling with so I have been waiting for my 16 year old nephew to come visit...

John (Tool Improvements) had a really simple idea of a thin plate that fit a dog, each of the 4 sides was a different offset to the guide fence and gave a common angle when used in the proper holes on the MFT.  That is the simplest solution I have seen, the dogs/guide fence act as a sine bar and the angle is calculated as the offset from one dog to the fence. I hope to get to that someday soon.

In the meantime I use this setup, with the MFT/guide fence clamp securing the loose end of the rail:

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Since the distance between the dogs is known and precise (96mm X 3) it serves as the hypotenuse of a right triangle so it is a matter of calculating the other leg and cutting a spacer to length. I found a simple app for my phone called "Trig Help", you enter the length of the hypotenuse and the degree of the angle you want and it calculates the rest for you.

Thanks.

RMW

 

[rljatl]

Put me down as interested in the Rip Dogs, too.  Already have the parallel dog kit.

 

[Sean KS]

Richard,

Could a slide mechanism like the ones on Osbourne miter gauges work too? The same hole spacing would always have to be used. But the sliding mechanism would allow infinite adjustment, while notching the adjustment arm could allow for positive stops.