Dan Pfeiffer
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Location: Euclid, OH USA Member Since: Mar 2009
Posts: 15
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« on: February 28, 2011, 06:52 PM » |
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Dan Pfeiffer
Euclid, OH USA
Festools: M0064 apron, tape measure, Denim Shirt
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vkumar
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Location: Sunnyvale, California Member Since: Jan 2007
Posts: 221
Sunnyvale (near San Jose) California
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« Reply #1 on: February 28, 2011, 08:04 PM » |
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Dan looks good. We had Qwas dogs, now Pfeiffer dogs  Vijay |
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Alan m
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Location: Ireland Member Since: Aug 2010
Posts: 3001
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« Reply #2 on: February 28, 2011, 08:11 PM » |
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nice home made dogs.
could i ask you what your avitar pic is please
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now
ts 55+2 1400 rails+ 1 lr32 1400 rail, domino+assortment systainer+ domiplate, ct 22 with boom arm+home made thien baffel, lr32 set, rotex 150, home made MFT,home made work center, 6 t locs for other tools, of2000 , ro 90, mft 800, trion , ls 130
wish list
of 1400, MFT 3,, even more t locs for other tools
"A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty."
- Sir Winston Churchill (1874-1965)
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erock
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Location: cleveland, ohio Member Since: Apr 2010
Posts: 559
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« Reply #3 on: February 28, 2011, 08:16 PM » |
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Dan nice job!
where did you get the 1" poly from? thanks
eric
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Kapex, Domino DF 500 Q set, Domino systainer, HL 850 E plus with bench unit, OF1400, TS 55, Trion PS 300, CXS set, MFT 800, MFT1080, MFT/3, CT 26, CT midi, DX93E, DX93 abrasive systainer, DTS 400, DTS 400 abrasive systainer, Rotex 125, ETS 125, (2) ETS 125 abrasive systainer, LR32 system, parallel guide extension kit, mini sys., multiple sys. 1-4, sys toolbox, FS 3000/2, (2) FS 1400/2, FS 800/2, lots of clamps, tape measure, multi toolie, utility knife, safety glasses, stein, folding rule, head lamp, XL fleece, XL sweater,(2) XL t-shirt, XL long sleeve shirt, XL training shirt, XL polo shirt, beanie, hat, FOG cap, banner, anti fatigue floor mat. I got a blog, check it out! http://dustfreewoodworking.blogspot.com/ |
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Dan Pfeiffer
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Location: Euclid, OH USA Member Since: Mar 2009
Posts: 15
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« Reply #4 on: February 28, 2011, 09:26 PM » |
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nice home made dogs. could i ask you what your avitar pic is please
The avatar is my super cool Tamaya Vega sextant.  Dan nice job! where did you get the 1" poly from? thanks
I got the 1" polycarbonate at Mcmaster Carr (mcmaster.com). About $8/ft. Mcmaster # 8571K16. They have a lot of other materials too. I got the delrin there and they have aluminum, stainless and just about anything else and they will have it on your door step tomorrow if you order by 3PM or so. |
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Dan Pfeiffer
Euclid, OH USA
Festools: M0064 apron, tape measure, Denim Shirt
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Tom Bellemare
Festool Dealer
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Location: Austin, Texas - USA Member Since: Nov 2007
Posts: 3572
Festool demo's & personal service in Central Texas
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« Reply #5 on: March 01, 2011, 03:27 AM » |
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Nice product, Dan.
Have you tried these at various temperatures? We go from ~15 degrees F (on very rare occasion) to ~115 degrees F (also on very rare occasion). It isn't unusual here to go for a week to a month above 85.
The Coefficient of Thermal Expansion of extruded acrylic is very significant.
Tom
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Dan Pfeiffer
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Location: Euclid, OH USA Member Since: Mar 2009
Posts: 15
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« Reply #6 on: March 01, 2011, 08:45 AM » |
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Nice product, Dan.
Have you tried these at various temperatures? We go from ~15 degrees F (on very rare occasion) to ~115 degrees F (also on very rare occasion). It isn't unusual here to go for a week to a month above 85.
The Coefficient of Thermal Expansion of extruded acrylic is very significant.
Tom
These are not intended to be products. Just something I made. I have not tested them in any manner except to see that they fit the holes in my MFT/3 and give good alignment. -15 to 115 F is pretty extreme work conditions. My shop may go from 40 to 85 in winter vs summer and that's where I use them. Have you tested the MDF top at these temperature extremes? Rather than using a dog material with low thermal expansion maybe you need one that matches the MDF. |
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Dan Pfeiffer
Euclid, OH USA
Festools: M0064 apron, tape measure, Denim Shirt
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Alan m
Online
Location: Ireland Member Since: Aug 2010
Posts: 3001
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« Reply #7 on: March 01, 2011, 08:48 AM » |
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if they are from the same piece of plastic should they not expand equaly. the diamiter orf the dogs doesnt matter as long as they are the same.
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now
ts 55+2 1400 rails+ 1 lr32 1400 rail, domino+assortment systainer+ domiplate, ct 22 with boom arm+home made thien baffel, lr32 set, rotex 150, home made MFT,home made work center, 6 t locs for other tools, of2000 , ro 90, mft 800, trion , ls 130
wish list
of 1400, MFT 3,, even more t locs for other tools
"A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty."
- Sir Winston Churchill (1874-1965)
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RL
Online
Location: Canada Member Since: Feb 2010
Posts: 2127
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« Reply #8 on: March 01, 2011, 09:05 AM » |
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if they are from the same piece of plastic should they not expand equaly. the diamiter orf the dogs doesnt matter as long as they are the same.
I think what Dan meant is not comparing dog to dog, but dog material to MDF material. |
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I like green.
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Tom Bellemare
Festool Dealer
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Location: Austin, Texas - USA Member Since: Nov 2007
Posts: 3572
Festool demo's & personal service in Central Texas
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« Reply #9 on: March 01, 2011, 10:58 AM » |
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What I meant was if they fit snuggly at 40 degrees, will they be stuck at 85?
Though I don't think MDF moves much at all, if it moved, the hole would shrink with temperature rise. The dog would grow and I'm pretty sure it would grow perceptibly with a 40 degree rise. I'll get some data and calculate it...
Tom
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Dan Pfeiffer
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Location: Euclid, OH USA Member Since: Mar 2009
Posts: 15
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« Reply #10 on: March 01, 2011, 11:31 AM » |
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What I meant was if they fit snuggly at 40 degrees, will they be stuck at 85?
Though I don't think MDF moves much at all, if it moved, the hole would shrink with temperature rise. The dog would grow and I'm pretty sure it would grow perceptibly with a 40 degree rise. I'll get some data and calculate it...
Tom
I don't want to start some crazy debate here but this is a basic property of materials and a common misconception. Heat makes things expand. If the thing has holes the holes expand too. The top of the work table, whether it's MDF, steel, plastic, marble, will expand with increasing temp. So will any holes in the material. They get bigger. So if you want a truly constant fit of the dogs you want them to have the same thermal expansion properties as the table surface. This assumes even heating. If you have the dogs in a plastic box on your dashboard and take them to the relatively cool table you have a different issue. |
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Dan Pfeiffer
Euclid, OH USA
Festools: M0064 apron, tape measure, Denim Shirt
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mhoy
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Location: Sunnyvale, CA Member Since: Oct 2008
Posts: 110
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« Reply #11 on: March 01, 2011, 01:02 PM » |
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If they fit and you're happy, then well, you're happy.  Here is a link to thermodynamics for everyone. http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/thexp2.htmlMark |
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TS 55 EQ, RO 150, CT 22, CDD 12, DF 500Q, OF 1400, MFT/3, RS400E
Elektra T1
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Tom Bellemare
Festool Dealer
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Location: Austin, Texas - USA Member Since: Nov 2007
Posts: 3572
Festool demo's & personal service in Central Texas
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« Reply #12 on: March 01, 2011, 08:24 PM » |
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'Sorry, Dan, backward logic about the hole on my part. I know well that if you heat a nut, it can release...
Tom
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worknfool
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Location: Soviet Maryland Member Since: May 2010
Posts: 15
If you can't use a hammer, it must be electrical.
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« Reply #13 on: April 03, 2011, 08:53 AM » |
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So that B/A sextant...used to square your MFT rail?  Dealt w/ McMaster a lot in past years. Not usually the best priced, but they do have everything, and they do get it to you quick like a bunny. Laird plastics is a nation wide concern I believe, and they are priced quite well usually. The one closest to me gives us off fall of all shapes and sizes when we think to ask while picking up other material. Also used to get a lot of usable "trash" from a local sign shop. They were happy to hold stuff for us as long as we took everything and got rid of it for them. Chunks of 1/2" acrylic for router bases that the local Woodcraft was asking $20+ for, free for the asking. |
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Maybe it's time to start building Gibbets in front our rulers' castles? Perhaps they'd get the hint.
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