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Counterboring hardboard methods

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Forum topic by HenryD posted 03-28-2011 06:09 PM 1210 views 0 times favorited 6 replies Add to Favorites Watch
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HenryD

30 posts in 1854 days


03-28-2011 06:09 PM

I’m building a jig out of 1/4 hardboard and I’m wondering what might be the best method for counterboring and placing t-nuts into the surface? If I use a 7/8” forstner bit (the size of the t-nut flange), do I drill at a slow speed or fast for hardboard. I’m going into the smoot side.

Thanks again, all

-- Put your waste wood to use - http://www.wiseheat.com


6 replies so far

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wseand

2605 posts in 1790 days


#1 posted 03-29-2011 05:06 AM

I tend to run it at a med speed and then when I get close to the depth I slow down. Make sure you keep the drill as plum as possible so it doesn’t make the t-nut off level when inserted. If you have any scrap of the wood you should run a test.

-- Bill - "Freedom flies in your heart like an Eagle" Audie Murphy

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fussy

980 posts in 1799 days


#2 posted 03-29-2011 07:53 AM

Henry,

I’m not exactly sure what kind of jig you’re building, but counterboring 1/4” material seems a bit risky. You might not wind up with enough to hold the T nut. I would either use thicker material, or just drill starter holes for the prongs and pull them through with the nut. But then I’m not sure what you’re making. Rest assured that a 7/8” forstner is going to chew pretty determindly, so keep it slow if you do. Let us know what you’re doing. I could be worried over nothing. Wouldn’t be the first time.

Steve

-- Steve in KY. 44 years so far with my lovely bride. Think I'll keep her.

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HenryD

30 posts in 1854 days


#3 posted 03-29-2011 06:56 PM

Steve,

I’m making a dado jig for my router. I have two 1/4 inch hardboard 2S2 pieces lamenated together so the thickness is 1/2.” 1 3/4 guide strips are attached with screws to this lamenated base. Half of the jig will be fixed square to 3/4 oak supports and the other half will float in slots with 5/16” studded handles screwed into the t-nuts (one on each end). I’m not sure how to drill into this hardboard material with a 7/8 forstner bit. I have a drill press with variable speeds and I have a battery powered drill with two speeds (fast, slow). I don’t have any scrap to test with. Believe it or not but my wife sold the rest of my 4×8 sheet at our garage sale!

-- Put your waste wood to use - http://www.wiseheat.com

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wseand

2605 posts in 1790 days


#4 posted 03-29-2011 07:06 PM

Your best bet is to use a drill press with the forstner bits so it ends up flat. You can also, on most drill presses, set the depth of the hole. So I would use it on normal speed and ease into the cut it wont be very deep.

-- Bill - "Freedom flies in your heart like an Eagle" Audie Murphy

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fussy

980 posts in 1799 days


#5 posted 03-29-2011 11:54 PM

Henry,

I should have known you’d have everything under control. That makes sense now. I would do it on the drill press at slow speed. Just make sure the hb is secure so it doesn’t get carried away by the drill bit. As Bill says, set your depth and ease into it. The hand drill is a little iffy as you want a flat hole of specific depth.

Now the big concern I’m sure I share with all the guys here: Are you sure that the rest of the hardboard is ALL your wife sold at the garage sale? My wife gets kinda wild-eyed at these things, and if I don’t keep an eye on her, she’ll sell my bandsaw for $13.50 and then go to another sale and spend it on used toasters or some such! Just keep your stuff out of her sight. Be careful, but have fun.

Steve

-- Steve in KY. 44 years so far with my lovely bride. Think I'll keep her.

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HenryD

30 posts in 1854 days


#6 posted 03-30-2011 12:04 AM

Yeah, no kidding! I told her she’s like a vacuum cleaner around my stuff. If it’s not tied down she’s wheeling and dealing it! Thanks for the advice. Looks like everything else in my shop is fine.

Later

Henry

-- Put your waste wood to use - http://www.wiseheat.com

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