Hot answers tagged

30

Jig saws are designed for cutting curves. You can cut straight lines and generally you followed the correct procedure - using a straight edge. Your picture of the cut is pretty blurry, so it's hard to tell for sure, but there are several possibilities: The piece of wood you used as a straight edge isn't as straight as you thought. Usually one uses a metal ...


22

Using an angle grinder you're going to end up with melted PVC clogging the blade, and possible fire from hot metal/sparks that you are grinding igniting the plastic, etc. As such, the suggestion to use a reciprocating saw (effectively a form of power hacksaw) is valid - however, since you already own a hacksaw, and it does not seem like it should be such a ...


21

As a novice-level wood cutter, I will say that what helped me the most with learning how to make straight cuts using a jigsaw was to slow down. You can certainly cut in a straight line, without a guide, if you take it slow, with some practice. More pressure against the blade equals more likelihood of not being straight - let the blade do the cutting, not ...


20

Here is how I have done it before without anything more than what I was already using, the material, pencil, a tape measure and a miter box.


19

You can make straight cuts parallel to an existing edge by using a circular saw with a guide. To make the bottom edge of the cut clean, be sure the saw does not cut much more deeply than the thickness of the material. You can also put tape on the cut line, before cutting, to prevent the saw from breaking off small pieces of the material on the top edge of ...


18

A sliding bevel, which is a fairly low-cost tool designed for exactly this type of job - the blade can be set to match an unknown angle and locked, then it can either be measured, or used directly in setting, or used to draw a line. No affiliation with or recommendation of the image source. Or, a piece of cardboard or stiff paper (fold or cut to match the ...


16

Whenever I want an arc that accurate I use my 3hp router (a smaller rated router will do too, just for smaller scale work) screwed to a shop made pivot (trammel) and make repeated passes, next pass deeper than the last to complete the cut. A circular saw may make that tight of a curve if you set the saw shallow enough to just cut through the material. It ...


15

Forget the guide block. Seriously. Jigsaw blades wander for a variety of reasons, and all of them will cause you to have a non-square cut, even if you have a square guide block. Instead, practice cutting to a line. (Or more accurately, cut most of the line on the waste side.) If the 'top' of the board is supposed to be the nice side, then mark the line on ...


13

My experience says to use the rotary tool, but I have always used metal boxes with plaster rings. I have no experience cutting drywall over plastic boxes. I do have three pointers for cutting with a rotary tool: Put as little pressure on the box from the drywall as possible. The more pressure against the drywall, the more likely that you'll get tearout ...


12

I think you'd do better with a Sawzall. That's the trade name - like Kleenex, everyone uses the name no matter what the brand. Just looked up - it is generically a reciprocating saw. These things can be dangerous beasts, but I think they'd be a lot safer for this type of job than an angle grinder. Buy/beg/borrow/rent - for one small job, any of the options ...


10

If you want to rip it (cut it on its long dimension), the only way to be sure it is straight is to use a table saw: If you want to cross cut it (on its short dimension), you can do that with a miter saw if the piece is not too wide: If you are confident in your abilities and it does not need to be exactly straight, you can make a line with a chalk line and ...


10

You can't figure this out without knowing how many boards your circle will have; once you choose the number of boards, just divide 360 by the number of bevels (one for each end of each board) and that's how far from 90° each end should be. So, if you have 4 boards (a square): 4 * 2 = 8 bevelled ends 360° / 8 = 45° each end should have a 45° bevel on it: ...


10

A jigsaw isn't designed to make perfect cuts. Straight cuts can be made but the stock has to be clamped down and the fence, guide block, must be clamped down too. You can't hold down a guide block with one hand and operate the saw with the other, the guide block will move and the saw will jump, as is obvious from your pictures. Clamp everything and use both ...


9

The most likely solution is to create a template and use a router with a bit that follows the template. The router would also be used for easing over any sharp edges. photo credit, sample image, not a product recommendation


9

How do professionals cut arcs? They don't use a saw to cut them. If you're the IKEA kind of professional, you have a monstrous milling machine. You program the arc into your CNC machine, and it just happens. If you're a carpenter, you rough-saw to the basic shape you want, plus a bit spare. Then you use a spokeshave, which is essentially a plane for curved ...


9

Yes, it'll be fine but heed the valid warnings given in the other answers about the minor risk of melting plastic and starting small fires. You won't instantly be sitting in the middle of a blazing inferno; it'd me more like having a few birthday candles in front of you, but the fumes are unpleasant.. The biggest risk from an angle grinder in this context is ...


8

Back in the day when I used to put up vinyl siding, I found that the best way to cut it with a circular saw was with a cheap 140 tooth plywood blade installed backwards (to give the teeth a negative rake and prevent chipping): For really hard plastics, I've used a diamond abrasive blade before and that did a great job (these are incredibly expensive if we'...


8

It sounds like you're using a crappy copper pipe cutter. To cut PVC, you want one of these instead: I've used mine to cut thousands of PVC pipes and it does the job quickly and easily. You can probably find one for less than $10 and it will serve you well for life.


8

I'd try to go through the slab and then below it. Most slabs are 6" thick with gravel underneath. You can rent a concrete core drill for around $60 from home depot. Stick a hole in your slab. Then you can use something called a 'sidewalk sleever' to tunnel under the slab. Then install pipe (a little tricky due to the elbow, and fill your hole back up ...


8

I've cut chair mats by laying them on a flat work surface. Then secure a metal straight edge along the cut line. (In my case I clamped a long piece of aluminum bar stock in place to the work surface with the mat in between). A utility knife with a sharp blade was then used to score a cut line along the straight edge. Chair mats are a relatively soft plastic ...


8

It's entirely possible, and often reasonable. Without going as far as buying a CNC router (handy, but expensive) simple jigs and sleds permit cutting precisely circular holes (eat your heart out, jigsaws) and precisely straight edges (like a tablesaw with no need to use a jointer afterwards - indeed, many people with tablesaws use a router jig to joint ...


8

Examine the blade disk to see if it has become gummy or coated with resin. You may have to remove the blade and scrub it clean. If the saw is not new the blade may be quite worn and need replacement. The teeth of a saw are bent slightly to the side (usually every other tooth to each side) to make the cut wider than the saw blade. Sometimes a saw blade ...


7

I prefer to hang the drywall loosely and use a rotary tool. But make sure you use a bit designed for this purpose -- the proper bit will have cutting flutes that don't extend all the way along the length of the bit, leaving a smooth round tip. This tip will follow the contours of the box without cutting into it, even if it's a plastic box. Note that if you ...


7

jigsaw. but really i think you underestimate how easy it is to cut through dimensional lumber with a sharp handsaw.


7

I used an arm screwed to my router to cut a curve in a benchtop, it worked well. The same technique could be applied to a jigsaw. screw a wooden block to the side of your jigsaws foot screw an arm to the block coming off at 90 degrees to the cutting direction. mesure the radius you want from the blade along the arm and put a pin (nail) through it at that ...


7

Your jigsaw can do the job, but it's far too prone to wander for a perfect line. But you can rough cut it below the line and then use some sanding to get it to the line you want. I would buy a new blade for this and make sure it has a high tooth count and/or is listed for fine or scroll cuts (if you're a masochist, you can try with a metal cutting blade, but ...


7

As the goal is just to make it smaller: I'd use a sledge hammer to fold it up until it fits in the car, or if there's room just store it (even outdoors) until the next council hard waste collection.


6

Gaps around boxes are normal when hanging drywall. The standard tool for a beginner is a keyhole saw and careful measuring. Realize when measuring that drywall will likely have up to a 1/4" gap with whatever it's adjacent to, so pad your measurements appropriately. That padding also needs to account for the box itself. So with the wonders of ascii art, you ...


6

Absolutely not!! Go for it, but hang on tight to the pipe, it has a tenancy to roll in a chop saw.


6

Chalk. Rub chalk over the boxes and tap the drywall against it. The chalk outline will appear on the back of the drywall and you can cut a pretty tight hole.


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