CNC Cut Portable Wortable - Page 5 - Router Forums
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post #41 of 63 (permalink) Old 02-22-2017, 08:34 PM
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Did you protect your top yet? If so what did you use?
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post #42 of 63 (permalink) Old 02-22-2017, 08:42 PM Thread Starter
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Two coats of clear finish - Parks Pro Finishes Poly.
Rust-Oleum Parks 1-gal. Crystal Clear Satin Water-Based Polyurethane-258690 - The Home Depot

So far, it has rejected the glue. Thank goodness.

That's my story and I'm stickin' to it!
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post #43 of 63 (permalink) Old 02-25-2017, 07:16 PM
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Mike another question the 2 x 4 used for bench supports if you make them flush with top horses you have lest than 50 % of material. I was thinking only 1.5 notch with tapered bottom. I have made notched grids that are inter locking and if dropped they break. I bought a 3/4 forester bit and drilled a hole with my drill press in 3/4 mdf took it to my home center and 3/4 bolts and 3/4 id x 1 od x 2 brass bush works just like a parf dog fits with no play with washer and nut.

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post #44 of 63 (permalink) Old 02-25-2017, 08:47 PM Thread Starter
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Mike another question the 2 x 4 used for bench supports if you make them flush with top horses you have lest than 50 % of material. I was thinking only 1.5 notch with tapered bottom. I have made notched grids that are inter locking and if dropped they break. I bought a 3/4 forester bit and drilled a hole with my drill press in 3/4 mdf took it to my home center and 3/4 bolts and 3/4 id x 1 od x 2 brass bush works just like a parf dog fits with no play with washer and nut.
I have been using the work bench with no problems while breaking down sheet goods. Since the notch in the 2x4 fits into the notch on the saw horse, downward force is spread through the saw horse legs to the ground. At least that is the way I see it.

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I bought a 3/4 forester bit and drilled a hole with my drill press in 3/4 mdf took it to my home center and 3/4 bolts and 3/4 id x 1 od x 2 brass bush works just like a parf dog fits with no play with washer and nut.
Hmmm...I don't think I have ever seen any grass bushings at my store. Probably wasn't looking for them.

Do you have any pics of your set up?
Thanks

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post #45 of 63 (permalink) Old 02-26-2017, 02:24 PM
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Mike I will not be able to get back at the project until Wednesday. I will post pictures then . I may be able to show the concept earlier they only had 2 of the bushings and I wanted 4 they were going to get 2more from another store.
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post #46 of 63 (permalink) Old 02-26-2017, 02:36 PM
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Default perf dogs

Here are concept pictures. I was wrong there called 3/4 sleeve Barrings.
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post #47 of 63 (permalink) Old 02-26-2017, 07:08 PM
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For me, that might be a good choice. My 3/4 inch holes are exact and the dowels don't fit. But I do have four dogs made on the lathe by a friend. They fit snugly. Maybe a bolt would be an even better fit.
A standard 3/4" bolt has a body diameter allowable range of .750 - .741"; a bolt at minimum allowable size would probably be too loose in the hole to give accurate location. Also, brass/bronze bushings are typically oversize on the OD and ID - the bushing is pressed into a nominal hole to fix it in place, and this causes the ID to shrink to give the correct fit to the shaft. A bushing assembled on a bolt will be loose. and this will add to any clearance between the bolt and hole to allow the bushing OD - which is used as the locator on the table - to further misalign with the hole. You could possibly select bolts which are towards the maximum size - bearing in mind that you still need some minimal clearance between the bolt and hole so it can be installed - and then try to find a bushing that is about .001 tight on the bolt, heat it to expand the ID, drop it in the bolt and allow to cool and you have a zero clearance assembly.
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post #48 of 63 (permalink) Old 02-26-2017, 07:37 PM
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Tom they fit nice and will work if holes are drilled with cnc.
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post #49 of 63 (permalink) Old 02-26-2017, 08:53 PM
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@roofner

How much clearance do you estimate between the OD of the bolt thread and the hole ID and the OD of the bolt body and the ID of the bushing? - the OD of the bushing can be offset to the hole, in any random direction, by half the diametral clearance. For woodworking, it may not give enough error to be significant, but remember that the errors can be in both the X & Y axis so the total will affect the 90 angle between these axes.

If you look on the Rip Dog website, they address compensating for clearance between the dog and the hole before tightening down the clamp bolt (or nut in your case). This makes installing the dogs a little fussy, but should help to minimize any locational discrepancies.
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post #50 of 63 (permalink) Old 02-26-2017, 10:27 PM Thread Starter
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Here are concept pictures. I was wrong there called 3/4 sleeve Barrings.
Thanks for the pics. I think I am giving up. I will just keep using my track saw the old fashioned way...measure and cut.

Another thing I noticed. Why do those guys cut up their MFT's? They can be expensive to replace. I always use a piece (or pieces) of insulation board under the work piece so the blade doesn't damage the table.

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