Thread: Clamp for Incra Jig

Hi, sorry for delayed reply. As DJ said, we are away from home ATM, so can't rally measure this for you till I get home next week.

Will get back to you then.

I'll second the Ludwig clamp. I bought the X4

The Lidwig clamps do look good for longer stock however when using the smaller timber the 50-55mm throat depth of the X4 will require a stock length of approximately 100mm before it will clamp the top of the stock. If the clamp is angled slightly over the main fence side you may be able to get slightly deeper than the 50mm but still not enough to adequately clamp smaller stock.

Do Incra make a shorter right angle fixture? perhaps 75mm instead of the 150mm?

Had a brainwave (didn't even hurt!)

Wht about one of those Pivot Hold Down Clamps from Incra?

They are about 2/3 down the page.

They would make use of the existing right angle attachment and don't need a clamp to go over the top.

Originally Posted by Sir Stinkalot

The Lidwig clamps do look good for longer stock however when using the smaller timber the 50-55mm throat depth of the X4 will require a stock length of approximately 100mm before it will clamp the top of the stock.

Why will it need a bigger throat on a clamp?

The router bit only pokes through for example on 19mm stock that's being routred which is 19mm thick and the Incra sled whatsit is abut the same again which leaves plenty of room for the X4. You can come in from the top of the sled or from the side. The clamping pressure is more than plenty to hold it without movement regardless of where it is clamped and will be well clear of any bit going around at a million miles an hour.

I'd take a picture to demonstrate what I mean but I'm here and the camera is in the house.

For shorter stock that you need to router you could always leave it longer than required and cut to size once you've routered it if you have to clamp from directly above.

Originally Posted by Sir Stinkalot

I have also tried to turn the right angle fence around to utilise the other channels with the hope of being able to lower the fence but it doesnt work. Its a bit of a worry now that I have put the fence around the right way as it leaves a 37mm gap from the table to the bottom of the fence which only allows 18mm of the timber to be in contact with the fence.

Make an L shaped backer board to fill the gap at the bottom of the right angle fence. You will still need some gap at the bottom as relief for the router bit and chips.
That will be a very narrow box at 55mm, with tails both sides there will not be much room left inside the box

Hi All ....

I have managed to do a drawing of what I am trying to get at. As you can see in the image the clamp would need at least 100mm throat depth if coming from directly above the right angle fixture. It may be possible to tilt the clamp over so it comes in from the side of the right angle fixture however it cant tilt to much as it will hit the main fence and even then it would still need quite a large throat depth. I have noticed even with medium sized stock if you clamp too high up on the board, especially if you are trying to cut a few at a time, the clamp has the tendency to angle the board slightly so that the bottom is wedged out slightly angled towards the router bit as the pressure isn't distributed near the middle of the board.

From memory it is possible to alter the attachment of the fence so that it is using the "B" attachment points (to mount the right angle fixture to the sled) which I think will put the bottom of the fence on or just above the table top, eliminating the gap (allowing for greater contact between the stock and the fence), however you would need to have a backing board and be very careful that you don't cut through it as the fence will be lower than the router bit.

If Incra made a 75mm right angle fence that can still attach to the fence then it would allow for clamping of smaller timber without a problem. The 150mm provided is great for larger boards but difficult with smaller.

The box in question is a pen box with box (finger) joints so it is quite small about 180mm x 50mm. I also have plans to make small ring boxes which will be about 50mm square. All with box (finger) joints if possible.

Routing with a longer piece and then cutting to size will not work as you still need pins on both ends (ok it will work for one end). A dovetail box may work as the small sections can be cut with the face of the board on the router table to cut the tail not the dove (from what I have seen in the video, I haven't tried dovetails before).

I have thought about Big Sheds idea before of mounting a toggle clamp to the face of the fence however I would need to see one in person to determine the suitability.

Hope the image clears it up a little.

Originally Posted by Sir Stinkalot

smaller.

The box in question is a pen box with box (finger) joints so it is quite small about 180mm x 50mm. I also have plans to make small ring boxes which will be about 50mm square. All with box (finger) joints if possible..

Thought it must be something like that

How about something like this, might need some sandpaper glueing on the face of the backer board to stop any movement of small parts and maybe two clamps.

Sorry for the delay in getting the pics, didn't get home till late last night.

From the edge of the bolt to the tip, its just short of 130mm as you can see in the attached image.

Attachment 104463

Thank you all for the replies ....

Sprog I like the idea of your system. It would be nice and easy to use as there is no need to try and hold the clamp in place whilst doing it up. It may become a task at the new wood show trying to find the appropriate parts when all the sellers are together and I can see a few options.

DJ .... thanks for the photo. It looks as if the 10" may be able to do what I need which is a relief. A 12" would be good as well but I cant find them in Australia. I will place an order with Carbatec.

There are a few other options at McJing such as a 300x150mm quick action deep throat F clamp or a hold dong clamp (basically half a g clamp) which may be suitable for something like Sprogs idea. They also have the 4" and 6" wooden handscrew clamps (I sent an email about a 10").

It is always the way with woodworking stores ..... you can never get everything you want in one go. If McJing had a 10" wooden handscrew then I would also get the deep throat F clamp and the hold dong clamp to try out since I had to pay for postage anyway. Unfortunately the only thing I need from Carbatec is the clamp so its a shame not to be able to add a few extra things together with the postage costs.

Originally Posted by Sir Stinkalot

There are a few other options at McJing such as a 300x150mm quick action deep throat F clamp or a hold dong clamp (basically half a g clamp) which may be suitable for something like Sprogs idea. They also have the 4" and 6" wooden handscrew clamps (I sent an email about a 10").

If McJing had a 10" wooden handscrew then I would also get the deep throat F clamp and the hold dong clamp to try out since I had to pay for postage anyway.

McJing have 4 6 8 10 12 inch wooden handscrew clamps

http://www.mcjing.com.au/categorybro...?categoryid=58

Originally Posted by Sprog

McJing have 4 6 8 10 12 inch wooden handscrew clamps

http://www.mcjing.com.au/categorybro...?categoryid=58

Thats funny ..... I did a search last night and came up with only the 4 and 6. I sent them an email last night on the off chance that they may have larger sizes as often stores do not list everything on line. I didn't get a response to the email but it looks like they have listed them online now.

Looks like my Friday night will be spent filling my McJing shopping basket with lots of goodies ......

Well just an update ...... I ended up with a 10" clamp and it seems to work much better than the 6". I am still having a little trouble with the smaller stock but it is something I will have to play around with.

Since I had a new clamp I gave it a bit of a workout!

A bit of an assembly line there.