Holdfast Testdrive
I had a blast today visiting with Jr. He lives about two hours north of me but I'll report more on the visit as a whole in another thread...this is is about the holdfasts.
I got back from Jr's at around 4:30, just in time to help get the kids cleaned up, fed, and put to bed. After that was taken care of I ran down the the basement and put the holdfasts through their paces. I never really thought about how to review holdfasts but I figured the essential qualities that a holdfast needs is to hold things and be quick and easy to use.
So, here goes.
Here is a picture of the various holdfasts in the dog holes to get a perspective on the various profiles. From front to rear they are:
Gramercy, Strasil, Peterson (small), and Peterson (large)
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You can see here that Jr's holdfast has a smaller shank diameter than the others and is very distinctive in that it is of two piece welded construction. My bench is about 2 and 1/4 inches thick and the dog holes are 3/4"
Obviously, if you have a thinner bench with 3/4" holes the smaller shank will skew in the holes even more. The relationship between holdfast shank diameter, dog hole diameter, and bench thickness is a bit complex to go into here, sufice it to say that in my bench Jr's holdfasts worked just fine.
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Here the holdfasts are just laying on the bench top from top to bottom they are Peterson(large), Strasil, Peterson(small), and Gramercy
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Okay, now for the review: I put used a scrap piece of 3/4" Ash. I used each holdfast to clamp the Ash to the bench and then pushed and pulled to see if there was a discernable advantage in holding power. Obviously, the harder you hit the holdfast the firmer it will hold the work, but if you really whack them I figured I'd either break them or reach their maximum holding power. All of the holdfasts were able to push and pull the whole bench around without letting go. So, while I couldn't determine a "winner" they all did the job.
Now, holdfasts also need to be easy and fast to use. This, in my opinion is where Jr's holdfast really shined. The small shank is the quickest and easiest to place in the dog holes. Mine were the hardest to put in the holes because they fit the tightest in the holes. I, of course could solve this by using slightly smaller stock or reaming out my dog holes a bit. I'll probably just grind down the shank of my holdfasts a bit so I don't waste the holdfasts I've made or have to make a bunch of new bench dogs.
Jr's and mine released about as easily while this is the weakness I see with the Gramercy's. Because the Gramercy's are the stiffest of the holdfasts they don't have as much spring, and tend not to "pop" up out of the holes as much. It was pretty much standard to have to hit the Gramercy holdfasts two to three times before they really released, while Jr's and mine typically released on the first or second hit.
You will notice that my holdfasts are shaped with a sharper and higher gooseneck. This was very intentional because when holding thin stock the Gramercy holdfasts will seat down into the bench enough that it's sometimes hard to hit with a solid shot to the back for release. You can cure this problem by using blocks, but since I was making my own, I cured that problem by changing the profile a bit. Jr. solved that problem by making the back corner a 90 degree corner.
Don't get me wrong, I really do like the Gramercy holdfasts. They work great, but they could be slightly better. If you don't have access to a forge or aren't willing to pay a blacksmith to make you some holdfasts, the Gramercy's are the way to go. Now, Jr. is apparently going into limited production of his holdfasts, and if things don't change it sounds like his are only marginally more expensive than the Grammercy's. If you want my advice, get in on this deal quick, before Jr. changes his mind!
Just to be clear; I'm not going to be competing with either Gramercy or Jr. I liked making mine and I enjoy using them, but I'm not interested in making them for sale... I only included mine for comparison.
Last edited by Don C Peterson; 06-20-2009 at 11:43 PM.
"History is strewn with the wrecks of nations which have gained a little progressiveness at the cost of a great deal of hard manliness, and have thus prepared themselves for destruction as soon as the movements of the world gave a chance for it." -Walter Bagehot