Different Types of Lifting Equipment

Any product that is utilised in the process of lifting, lowering or moving loads are broadly referred to as lifting gear, lifting equipMent or lifting tackle.

Different Types of Lifting Equipment

Different Types of Lifting Equipment

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Different Types of Lifting Equipment

Different Types of Lifting Equipment

All kinds of lifting gear are used either for safety reasons to protect personnel against injuries while lifting heavy loads otherwise for the reason that the item is just way too heavy for any person or persons to lift without help. All types of lifting gear should be regularly inspected and tested by a certified individual to guarantee the safety of the device.

Now we are going to look closer at the commonest lifting gear devices from little to big.

A shackle is a "U" shaped device made out of robust metal, they usually incorporate either a pin or a bolt used for safely locking on. Shackles arenormally used as a connector to secure items together.

An eyebolt is a screw having a ring on the end as opposed to a screwdriver slot, they may be screwed into numerous surfaces to provide a securely fixed anchoring point to which further items could be attached too.

Ratchet lashings or load restraints are not just used daily by many lorry drivers but additionally by the general public, they are widely used for tying down and securing items, just like camping gear on a trailer, the webbing strap is threaded through a cam buckle which when pulled taut will hold the load securely but enables swift release of the load when needed.

There are many varieties of lifting slings available, from web slings, chain slings, wire rope slings and even, all intended for differentpurposes, the softer webbing slings tend to be utilised for lifting more delicate or easily marked loads and chain slings for a tougher and much more versatile approach as they can be used in several combinations for different load types.

Pallet trucks are straightforward devices on heavy duty wheels that are widely used to allow the simple moving of large items from one place to another, while taking up little room, they are most frequently used in warehouses.

Sheet materials such as steel sheeting are lifted by way of either a plate clamp, utilised in two's (often more) and clamp the fringe of the plate in its jaws, these may mark the steel, this is where lifting magnets as in, these tend not to scratch the steel plate as they use a magnetic force to lift, however they'llonly work with ferro-magnetic materials, and precise lifting conditions will apply for a safe lift.

A beam clamp does precisely what it says, it clamps to a beam, often on a mobile gantry crane jib or providing a secure fixing point for added lifting devices. To beam trolley also fixes onto the projection of a beam to provide a fixing point, however incorporates wheels so the trolley can be moved across the beam, these are additionally obtainable in electrically powered versions for even easier moving.

Next we examine some larger lifting products frequently used.

Ratchet lever hoists are manually driven tools, attached to the load, the lever is raised then lowered and the chain moves across a ratchet system to raise and lower the load, they may be also used for> tensioning and securing loads. Chain blocks or manual chain hoists are also a popular way of manually lifting loads and works by pulling on the chain 1 to lift the load and the other side of the chain to lower the load.

Electric hoists are very popular as they Supply an easy means of lifting heavy loads, many differing kinds can be found, suitable for various purposes and also lifting capacities. Most electric chain hoists use to wire rope hoists lift but are also obtainable. An additional powered hoist is the pneumatic Air hoist working from an Air Supply and excellent where electric isn't accessible or not suitable.

Mobile or gantry lifting cranes provide a transportable framework to connect your lifting hoist too. A non-permanent device which can be moved on its castors toanywhere it may be required, these are usually manufactured to fit your size and lifting capacity needs, and consist of 2 "A" shape end frames which has a "H" beam across the top. This is a very popular piece of lifting gear.

A Jib Crane is a semi permanent device which is extremely popular in both large and small industries. The jib cranes arm can be swung or slewed around its vertical fixed column, up to 360 degrees depending on the type chosen.

An overhead crane is a much larger piece of lifting gear, frequently utilised in large manufacturing factories, high up within the ceiling space. They lift and move loads across a track by means of remote control and hoists. These are a fixed device so almost certainly not so versatile as the mobile gantry.

Different Types of Lifting Equipment

How to Troubleshoot Blade Breakage

One issue I would like to help sawyers better diagnose is the irritating problem of dealing with premature breaking of bandsaw blades.

How to Troubleshoot Blade Breakage

How to Troubleshoot Blade Breakage

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How to Troubleshoot Blade Breakage

How to Troubleshoot Blade Breakage

This can only be answered with a series of questions to correctly troubleshoot the problem. If you call me with this problem here is what I'm going to ask:

Question... What kind of band wheels do you have?

I have found over the years that most major mfg's have gotten away with using untrue bandwheels for the simple reason that there are so many areas for which blade breakage can be blamed.

Band wheels that are untrue will snatch the blade apart. Example: A 19 inch wheel is 4.97 ft around the wheel (circumference). A nominal band speed of 4970 ft per minute would put the wheel turning 1000 RPM.

Which is 16.66 rounds for second. Multiply 16.66 RPS x 4.97 (cir) = 82.80 feet per second of the band being pulled through his cut. So if you're using a 13 ' 2 "for example, that blade is making a complete revolution 6.24 times per second. During each revolution of the band there are two wheels it must go around. I know 2 x 6.24 equals a nominal 12 times per second that a band goes around a wheel. That's a mile every minute!

When the band wheels end up being the culprit of broken blades I find they are always out of round by at least. 015 of an inch or worse.

Now multiply 2 wheels x. 015 "out of round and you get. 030" that the band wheel is snatching (stretching the blade) to the revolution. There is a. 030 "stretch happening in the area between the guides and another. 030" in the non-cutting area. This totals tostretch of the blade, or a potential stretch of the blade by 60 thousands (1/16th of an inch). This shock is happening 12 times per second!

The band simply can't take this punishMent.

Many V-belt sheaves (pulleys) are out of round by. 015 "thousands and have a v-belt tucked in the v-grove. This v-belt becomes a rubber shock absorber. This belt is the only reason that a v-belt sheave can work being so out of round.

The v-belt shock absorber needs to be changed on regular intervals. If the belt gets worn internally (which you cannot see or measure) it breaks down internally and looses its ability to absorb shock. At this point the blade is suffering greatly and blades begin to break, seemingly without cause.

Question ... Were the blades rising or diving before theybroke?

If they were that would account for the breakage, and diagnosing the reason for the rising or diving is the next step, which by the way, is normally a blade body flatness issue. There is a great amount of stress and heat being administered to the band. A good cutting sawmill blade has the least amount of stress.

Question... What kind of blade guides do you have?

I believe that roller guides are the best for cutting 8 inches or wider. I have proved this hundreds of times. I believe that sandwich guides are the best for narrow cuts such as pallet resaws cutting 6 inches or less.

When using sandwich guides it is very important that your wheels are true. If the wheels are not true with sandwich guides the blade will hammer the guides up and down as the wheel is going up and down with each revolution.

Most resaws have steel wheels, but for those that have belted wheels I would suggest using roller guides because of the wheels being out of round the blade life will always be less than your competitors who has true steel wheels.

Question ... What kind of steering do you have on your sawmill?

I like tensioners that are able to give and take. When the blade stretches during the cut, and warms up in spring or Air steering will take the slack and when the band is out of the cut it will cool down and the Steering will give back to the band.

A hydraulic steering is dead tension and will not take or give during the sawing process. I am not saying Hydraulic will not work, because many of you reading this article know you aresawing every day with it, but it does contribute to poor blade life.

Question ... Are the blades breaking from the front or the back?

This is important to notice. The first break will have discolorations and the last break will be bright steel. To band breaking from the front is due to some type of stress. It could be from sawing blade stress, too much tension, bad wheels, or grinding stress.

When blade that breaks from the back, I have found that 95% of the time it has taken on damage from something dragging on the back of the blade. Such as a bearing that should be spinning freely but is dragging on the back of the blade, rubbing a bolt, or rubbing to guard.

All of these things create an instant heat that crystalizes the surface of the back of the blade and causestiny cracks to form. To identify this, bend the blade more sharply and look at the back of the blade and you will notice the multiple cracks. All sawmills that use back-up bearings on the guide system need inspection daily.

Question ... Do the blades break in the first run or after sharpening?

If they are breaking on the initial run, you must first determine if you're running your blades too dull rather than changing them at the first sign of dulling.

Secondly, some people report that after they sharpen the blade it cracks in the gullet. This could be caused by running too dull or grinding too hard in the gullet. If you're grinding so hard and Fast that it leave a heavy burr on the back side of the gullet, it is not good for the blade. Grind as lightly as possible to allow thegrit of the rock to cut rather than melt the steel away. A ceramic Rock works best on the Cook's Cat Claw sharpener.

I hope this has helped you with a bit more understanding on how to troubleshoot breaking blades. Please keep in mind when you make a correction you will need to use a new sawmill blade to see if you have fixed your problem. A stressed blade will never run like a new blade.

How to Troubleshoot Blade Breakage