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Hold Down Clamp - Knobs

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Project by Karson posted 1260 days ago 3063 views 4 times favorited 19 comments Add to Favorites Watch

Lisa – DustBunny posted some hold down clamp knobs that she made for her Torque machine.

I noted that these would be a great addition to hold down knobs.

I searched around the shop for some larger pieces that might have started out as Pen Blanks. They were Misc species and size.

I chucked them in a lathe and turned them round. I then cut off the pieces for the knobs. So they were different lengths and different sizes around. I was kind of searching what might be the best size.

I chucked the cut blank in the lathe and drilled the holes on the end for the nut. All of mine were metric. I drilled the hole with a Forstner bit about 1/4+” so that the nut was flush with the surface. I then drilled a 5/16” hole a little deeper for the shaft of the bolt.

I epoxied the nut in and put a washer on the end surface and let them dry.

I didn’t need the tap that Lisa used – mine all screwed on fine.

The wood species from left to right

2 – Teak, 3 – Ambrosia Maple, 3 – Hickory, 3 – Osage Orange

I need to make some additional for the rest of the clamps that I’ve got on the jigs in the shop, and also a few for some smaller clamps.

Thanks Lisa for the suggestion.

I might need to revise this revision to the clamps to make a checker size piece on the lower nut to be able to hold it tight while the upper nut is being tightened with the knob.

-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Southern Delaware karson_morrison@bigfoot.com †





19 comments so far

View TopamaxSurvivor's profile

TopamaxSurvivor

14397 posts in 2175 days


#1 posted 1260 days ago

Good idea. Any ideas on the best size??

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View a1Jim's profile

a1Jim

109230 posts in 2076 days


#2 posted 1260 days ago

they look good Karson a tool we could all use

-- http://artisticwoodstudio.com Custom furniture

View Karson's profile

Karson

34795 posts in 2899 days


#3 posted 1260 days ago

The size didn’t seem to matter. The longer ones gave more grip area for my big hands, But the longer ones also hit the handle of the clamp sooner when it was opened.

If the hold down piece is closer to the pivot point of the clamp, there was greater impact to the opening.

But I usually have the rubber block toward the end of the clamp. I just try to get them clear of the router bit when pattern routing and seem to mount the clamp back from the edge.

These clamps have about 1/2” of adjustment so I find the the mounting base of the clamp need to be about the same thickness of the piece being held. I sometimes mount them higher and use filler blocks to adjust the space between the hold down clamp and the work piece.

But it was a lot easier to tighten that using the wing nut.

Anyone need 25 metric wing nuts?

-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Southern Delaware karson_morrison@bigfoot.com †

View lew's profile

lew

9827 posts in 2254 days


#4 posted 1260 days ago

Great idea, Karson—I’m off the lathe now!!

Lew

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View dustbunny's profile

dustbunny

1149 posts in 1794 days


#5 posted 1260 days ago

Thanks Karson !
Glad to see it was a useful idea and I was able to share it.
I never thought about it for the hold down clamps…I like that : )
Maybe for the bottom nut you could turn a round piece, cut it to 1/2” ? thick,
spindle sand four half circles at 45, 90, 135 and 360…like a star knob,
and set your nut in the center.
Just thinking….

-- Imagination rules the world. ~ Napoleon Bonaparte ~ http://quiltedwood.com

View brianinpa's profile

brianinpa

1809 posts in 2222 days


#6 posted 1260 days ago

There goes another item onto my to-do list. Great idea.

-- Brian, Lebanon PA, If you aren’t having fun doing it, find something else to do.

View Karson's profile

Karson

34795 posts in 2899 days


#7 posted 1260 days ago

Lisa, I dont think that you would need to do the spindle sander route. You could use a square piece of wood that you cut off on the bandsaw or table saw.

I was thinking the same thickness as the nut because the space at the bottom can get pretty tight to the rubber block. So I was just thinking Drill a block on the lathe maybe 2-3”, Sand the corners off just a bit and then cut a bunch of slices and glue in the nut. I’m not even sure if I’d use the washer to save space.

-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Southern Delaware karson_morrison@bigfoot.com †

View dustbunny's profile

dustbunny

1149 posts in 1794 days


#8 posted 1260 days ago

Yup, now your talkin”....
I’ll watch for the post : )

Lisa

-- Imagination rules the world. ~ Napoleon Bonaparte ~ http://quiltedwood.com

View Lee A. Jesberger's profile

Lee A. Jesberger

6642 posts in 2479 days


#9 posted 1260 days ago

Nice job, Karson.

Lee

-- by Lee A. Jesberger http://www.prowoodworkingtips.com http://www.ezee-feed.com

View PurpLev's profile

PurpLev

8473 posts in 2147 days


#10 posted 1260 days ago

great idea Karson – thanks. I’ll have to make a few when I get a moment. It definitely seems like a great accessory

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

View sedcokid's profile

sedcokid

2651 posts in 2097 days


#11 posted 1260 days ago

Great Idea Karson!! But what is going on with BURP12…. This does not belong on LJ’s site!! This is discusting, How can we prevent this from happening AGAIN!!

-- Chuck Emery, Michigan,

View Gregn's profile

Gregn

1642 posts in 1482 days


#12 posted 1260 days ago

Karson and Lisa, Have either one of you tried using threaded inserts instead of epoxying a nut and washer in place? Just a thought as I’ve seen this done before, but no one has ever said that they have used threaded inserts. Wondered if there was maybe a reason for not using the threaded inserts.

-- I don't make mistakes, I have great learning lessons, Greg

View Karson's profile

Karson

34795 posts in 2899 days


#13 posted 1260 days ago

Gregn:

I’ve used threaded inserts before but that would be a purchased product. These hold down clamps are metric bolts so it would require metric threaded inserts and then the nuts are free (Already installed on the hold down clamp) So it’s just easy.

I’m not putting enough torque on the nut to break it loose. I originally planned to drill the hole undersized and then use a chisel to cut the flats of the nut and make the hole six sided. After drilling the first one small. I changed my mind and drilled it again big enough for the nut to fall in the hold and then used epoxy to fill in the gaps.

We’ll see how it holds up over time. I did turn it quite hard and didn’t have anything break loose except when the glue wasn’t dry and I re-applied some more glue to the nut.

-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Southern Delaware karson_morrison@bigfoot.com †

View AttainableApex's profile

AttainableApex

338 posts in 1332 days


#14 posted 1260 days ago

where did you get those hold down clamps?

-- Ben L

View Ken90712's profile

Ken90712

14500 posts in 1688 days


#15 posted 1260 days ago

Perfect Karson they should serve you well.

-- Ken, "Everyday above ground is a good day!"

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