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BENCH HOLDFASTS AND DOG HOLES (See Update )

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Project by kiefer posted 01-29-2015 12:13 AM 4909 views 31 times favorited 40 comments Add to Favorites Watch

UPDATE
The hold downs have been modified and made stronger by adding a nut on the underside in one design upgrade and in the other upgrade design I added two nuts and washers . (see Picture ) I had no problem with the original design but someone came along and used a 5 LBS steel mallet to drive the hold down tight and popped the top off .(IDIOT )
See Pictures 4 and 5

Here is my set of holdfasts that I made for next to nothing about $7.00 for the pair which is a far cry from what the store would charge .
I made some clamp type holdfasts some time ago and they work just fine but take a little long to tighten and after watching others using the mallet to tighten theirs I looked into making the change .
After reading some blogs I found good and bad opinions about the forged steeltype and it not grabbing in the dog holes and slipping and the top being to thick etc. etc.and that led me to make my own design .
I started with a piece of 1 7/8” oak and drilled it for a 3/4” piece of Acme rod and cut out the shape .
When I started using it it tightend quite well but it also marked the dog hole with the threads on the rod and I thought of a solution to prevent that .
The answer is a piece of 3/4” x 3” copper pipe driven into a 7/8” hole which gave me a slight oversize 3/4” hole and after further playing with the idea I decide to use standard 3/4” threaded rod which gave a even better hold .
The way it all worked out there is very little marking of the thread inside the doghole and all the new and existing dog holes will be done like this even so I have to make a slightly oversize dog to fit the new holes .

Klaus

-- Kiefer https://www.youtube.com/user/woodkiefer1/videos





40 comments so far

View Woodbridge's profile

Woodbridge

3460 posts in 1881 days


#1 posted 01-29-2015 12:24 AM

Looks very interesting. I look forward to seeing the video. It also nice to see a well used workbench top.

-- Peter, Woodbridge, Ontario

View shipwright's profile

shipwright

7168 posts in 2261 days


#2 posted 01-29-2015 12:45 AM

They look nice Klaus. Do you think they will hold as tight as metal ones?
I have the Gramercy tools ones formed from 3/4” steel “wire”. I sometimes beat on them pretty hard to get a real death grip on something. They are a terrific way to hold a workpiece and I use them a lot.
I hope yours work as well for you.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees. http://thecanadianschooloffrenchmarquetry.com/

View Todd Swartwood's profile

Todd Swartwood

257 posts in 1188 days


#3 posted 01-29-2015 01:56 AM

Nice ides Klaus,
I have a set of the iron hold downs and have never been able to get them to hold. I think I will give your idea a try.
Thanks for posting your ideas, as always quite inspiring.
Have a blessed evening, Todd

-- Todd Swartwood (Todd Swart-Woodworks)

View kiefer's profile

kiefer

4881 posts in 2130 days


#4 posted 01-29-2015 02:01 AM

Peter
Here is the video Peter take a look and let me know what you think and yes that bench is used ,no mercy !

Paul
Good results so far and watch the video and give me your thoughts !

Todd
Watch the video and see and let me know what you think .

Klaus

-- Kiefer https://www.youtube.com/user/woodkiefer1/videos

View hoss12992's profile

hoss12992

3831 posts in 1356 days


#5 posted 01-29-2015 02:31 AM

Those are awesome. Great job

-- The Old Rednek Workshop https://www.facebook.com/theoldrednekworkshoptn

View doubleDD's profile

doubleDD

5226 posts in 1506 days


#6 posted 01-29-2015 02:34 AM

Hi Klaus. Just watched your video and was interesting to say the least. Looks to have some strong holding power with little effort on the mallet. Holding that 1×6’’ on edge was very impressive. Did you say you are drilling a set of new holes for them or re-drilling the old ones to fit the pipe? Will other bench accessories fit in the copper pipe? Either way I will be looking into this further. The explanation in the video was great. I’ll be back.

-- Dave, Downers Grove, Il. -------- When you run out of ideas, start building your dreams.

View kiefer's profile

kiefer

4881 posts in 2130 days


#7 posted 01-29-2015 02:40 AM

Thanks Hoss
Thanks for taking a look .

Dave
The dog the existing dog holes will be redrilled and new ones added once I decide where to place them.
I will have to make new dogs to fit the new hoe size since it is a little more then 3/4” but to fit accessories should not be a problem as I will build them anyway .

Klaus

-- Kiefer https://www.youtube.com/user/woodkiefer1/videos

View DocSavage45's profile (online now)

DocSavage45

7703 posts in 2306 days


#8 posted 01-29-2015 02:58 AM

Nice work,

I’ll check you out on the smart tv later. I can see how the threaded rod ads griping power, and I wonder if the hardness of the rod with wear on the copper piping?

-- Cau Haus Designs, Thomas J. Tieffenbacher

View HillbillyShooter's profile

HillbillyShooter

5811 posts in 1755 days


#9 posted 01-29-2015 03:22 AM

Great idea and interesting design—hope they work well for you. Let us know how you like them after you’ve put them through the paces.

-- John C. -- "Firearms are second only to the Constitution in importance; they are the peoples' liberty's teeth." George Washington

View  woodshaver (Tony)  's profile

woodshaver (Tony)

4010 posts in 2816 days


#10 posted 01-29-2015 03:43 AM

Just watched your video Klaus… well done! I think your bench dogs are worth much more than 7 dollars. I like how you walked us through your entire thought progress on the video. Now if I only had a bench that nice to put those dog to work on.
Thanks for sharing your great ideas.

-- Tony C UAW, St Augustine FL, My high school shop teacher said "You can do it"... Now I can't stop!

View kiefer's profile

kiefer

4881 posts in 2130 days


#11 posted 01-29-2015 03:54 AM

Thomas
No worry on the copper pipe it can always easely replaced .

John
It seem to work well and it has the grip way better than expected .
I will let you know how it does .

Tony
Videos are a great way to get the thought and ideas across and you better get going on a bench don’t procrastinate like I did they are worth the effort !

Klaus

-- Kiefer https://www.youtube.com/user/woodkiefer1/videos

View doubleDD's profile

doubleDD

5226 posts in 1506 days


#12 posted 01-29-2015 04:16 AM

Hi klaus. Just had to go to the shop and check out the copper pipe and 3/4’’ threaded rod idea. It works very very well. Plus the other accessories are just a tad small. As you said, an easy fix, especially if you make your own. Looks like I will be strongly considering adding to the bench. Thanks.

-- Dave, Downers Grove, Il. -------- When you run out of ideas, start building your dreams.

View shipwright's profile

shipwright

7168 posts in 2261 days


#13 posted 01-29-2015 04:24 AM

Well. Klaus, I watched the video and I am impressed. They seem to be very strong and solid.
I’m a little surprised that the wood is standing up but it certainly seems to be.

Why would I ever doubt you? :-)

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees. http://thecanadianschooloffrenchmarquetry.com/

View Rick M's profile

Rick M

7913 posts in 1843 days


#14 posted 01-29-2015 04:42 AM

You should have retired decades ago Kiefer, woodworking wouldn’t be the same.

-- http://thewoodknack.blogspot.com/

View kiefer's profile

kiefer

4881 posts in 2130 days


#15 posted 01-29-2015 04:52 AM

Thanks for your interest Dave.

Paul
the wood was my worry but if you look at the forces involved it seems to work .
I my laminate up some hickory and give that a shot .

Rick
Why its too much fun .

-- Kiefer https://www.youtube.com/user/woodkiefer1/videos

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