LumberJocks

Bench Dog Problems.

  • Advertise with us

« back to Wood & Lumber forum

Forum topic by Elvispat posted 07-16-2013 01:59 AM 1545 views 0 times favorited 17 replies Add to Favorites Watch
View Elvispat's profile

Elvispat

6 posts in 1240 days


07-16-2013 01:59 AM

Topic tags/keywords: bench dog roubo question

This is my first time use this system. I have a question that I hope someone can answer. I have recently have completed a work bench. Roubo style. During the build I was using the bench dog hole with great success. Not that I have finished the bench and have put a finish on it and trying to keep the finish from entering the 3/4” dog holes, my iron bench dog will not hold. I’ve tried sanding the hole with no success. Do anyone have any ideals how to fix this problem?

Thanks in advance,
John

-- John, Tennessee


17 replies so far

View redSLED's profile

redSLED

790 posts in 1356 days


#1 posted 07-16-2013 02:28 AM

Your iron bench dog will not hold – how? Does it slip out, doesn’t go in or is it looser or does it get stuck?

-- Perfection is the difference between too much and not enough.

View crank49's profile

crank49

3981 posts in 2435 days


#2 posted 07-16-2013 02:56 AM

What changed between “used DURING the build with great success” and “now it won’t hold”.
Is the top thicker now? The hole bigger? something get spilled in the hole?

And what kind of dog you talking about. Is it a bench “Dog” or a “Holdfast”?
If it’s a Holdfast, is it cast iron or wrought iron?

-- Michael: Hillary has a long list of accomplishments, though most DAs would refer to them as felonies.

View Elvispat's profile

Elvispat

6 posts in 1240 days


#3 posted 07-16-2013 09:06 AM

My bad. It’s a holdfast and not a bench dog. Sorry about that. The bench top is 4” thick and the hole is 3/4” diameter. The holdfast stopped holding after I applied the finish (equal parts boiled linseed oil, varnis, paint thinner). I tried to make sure I didn’t get any in the holes but I believe I soaked in on the edges. I’ve tried sanding the hole and no change. Is there some type of solvent I can use that will fix this that will not harm the bench? The bench top is Red Oak.

-- John, Tennessee

View theoldfart's profile (online now)

theoldfart

8106 posts in 1915 days


#4 posted 07-16-2013 11:41 AM

Try roughing up the shaft of the holdfast. Also I think many holdfasts don’t like a 4” top. May possibly need to counterbore from underneath! Check with Gramercy or any other company that makes them. God luck

-- "With every tool obtained, there is another that is needed" DonW ( Kevin )

View bondogaposis's profile

bondogaposis

4030 posts in 1815 days


#5 posted 07-16-2013 11:57 AM

Sand the shaft of the holdfast w/ 100 grit at right angles to length of it. It is amazing what a difference that makes.

-- Bondo Gaposis

View Elvispat's profile

Elvispat

6 posts in 1240 days


#6 posted 07-16-2013 12:37 PM

4” thick top was no problem prior to the finish being added. I did sand the iron with 100 grit with no satisfaction. But didn’t sand at a 45 degree angle. I’ll try that and let you know. Also I did sand the holes with 80 grit sand paper with no change. Thanks for all the info and I’ll let you all know the outcome. When I figure out how to post pictures, I’ll post some of my new bench. I did add it as my profil image if its not to small to see.

-- John, Tennessee

View PurpLev's profile

PurpLev

8523 posts in 3112 days


#7 posted 07-16-2013 12:52 PM

is the top 4” throughout?

4” could be a bit too deep of a hole to hold a holdfast – it keeps the holdfast almost completely vertical and doesn’t allow the holdfast to tilt which is what holds the holdfast in the first place. – you might want to consider counterboring the dog holes from under the workbench 1-2” deep – that might allow the holdfast to tilt enough to grab.

curious – what did you finish the workbench with (that it interferes with it’s functionality so to speak)?

-- ㊍ When in doubt - There is no doubt - Go the safer route.

View BigRedKnothead's profile

BigRedKnothead

8004 posts in 1446 days


#8 posted 07-16-2013 01:11 PM

Hey man, My benchtop is 4” thick. As gramercy tools warned, I couldn’t get my holdfasts to work until I reemed(widened) out the bottom of the dog holes a little(under the bench). I used this stepped or “uni” bit. Worked like a charm. -Red

-- "At the end of the day, try and make it beautiful....because the world is full of ugly." Konrad Sauer

View HorizontalMike's profile

HorizontalMike

7147 posts in 2378 days


#9 posted 07-16-2013 01:41 PM

Lots of good advice above. I have also seen where some have even used a hole punch to make a series of pings along and around the holdfast portion that resides in the benchtop.

-- HorizontalMike -- "Woodpeckers understand..."

View Pete Pedisich's profile

Pete Pedisich

138 posts in 2111 days


#10 posted 07-16-2013 01:57 PM

John,

Same thing just happened to me last week – got just a teeny bit of my oil/wax mixture in the holdfast hole and my Gramercy holdfast would not hold. I had roughed them up with 150 grit as well. I then soaked a shop towel in Denatured Alcohol and stuffed it in the hole and twisted it through the other side so it scrubbed the walls and let it dry – bingo, the holdfast held like a clamp!
My top is 3-5/16” (3.3125”) thick.

Good Luck!

-Pete

View crank49's profile

crank49

3981 posts in 2435 days


#11 posted 07-16-2013 05:35 PM

That reamer trick with the uni-bit is what I tried after reading about it here on LJ a few months ago. Worked good for me. My bench is 3 1/2” thick.

-- Michael: Hillary has a long list of accomplishments, though most DAs would refer to them as felonies.

View HorizontalMike's profile

HorizontalMike

7147 posts in 2378 days


#12 posted 07-16-2013 07:06 PM

mis-posted sorry…

-- HorizontalMike -- "Woodpeckers understand..."

View redSLED's profile

redSLED

790 posts in 1356 days


#13 posted 07-16-2013 09:13 PM

bench dog problem.

-- Perfection is the difference between too much and not enough.

View OggieOglethorpe's profile

OggieOglethorpe

1212 posts in 1574 days


#14 posted 07-16-2013 09:24 PM

I bought my Grammercy holdfasts in-person in Brooklyn, from Joel Moskowitz.

He showed me how to crosshatch the part of the shaft that goes in the dog holes with 80-100 grit, and strongly suggested it be done, as mentioned several times above. It’s quick and easy, so give it a shot.

View theoldfart's profile (online now)

theoldfart

8106 posts in 1915 days


#15 posted 07-16-2013 09:32 PM

Good one redsled! lol

-- "With every tool obtained, there is another that is needed" DonW ( Kevin )

showing 1 through 15 of 17 replies

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com