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Grinding is generally considered to be a finishing operation. Possibilities include resharpening cutting tools, surface grinding of work fixtures and mold sections, ID and OD grinding of valve bodies, and many other potential applications.
Grinding has many different applications in the machine tool industry. The grinding operation can be performed on a variety of machines such as the lathe and the mill - with the appropriate add-on accessories. However this topic will focus primarily on surface grinding, cylindrical grinding, and universal grinding machines.
| | | | | | | | | | | To be successful with grinding, it is necessary to understand some basic principles. Grinding  uses a method of material removal called abrasion . Rather than cutting like a lathe bit, the material is slowly worn away because the abrasive is harder than the material being ground. In truth the grinding wheel acts like many thousands of very small lathe bit, each cutting off some metal.
The abrasive must also be strong enough to withstand the forces acting upon it while grinding. Usually some sort of impact shock occurs when the abrasive comes in contact with the material
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Motor Rewinding
Posted by: Admin on Friday, November 25, 2005 - 04:18 AM (884 Reads)
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1. Rewinding a motor is the last desparate step to take in repairing it.
Very few Flyer motors, except for the Baldwin switcher's, need to be
rewound.
2. You can't usually tell if a motor needs rewinding by looking at it.
Many Flyer motor windings that appear to show signs of burning actually
work quite well. 4. Motors need to be rewound for two reasons: because excess heat has
damaged the insulation so that electricity passes from winding to winding
without going thru them all, or else because the winding has been cut in a
place that is not near the end of the coil. 5. Determining if a motor needs to be rewound requires some special
equipment - an AC ammeter and a 1 volt AC power source. I don't know how
to do it. 6. You can get some indication of the situation sometimes using a VOM. No
continuity between field coil terminals or commutator poles means a broken
winding. Often the break can be located visually or by unwinding a turn or
two of the broken coil. If the break is near the end, the loss of a few
windings will not have much effect. There are three possible pairings of
the three commutator plates. If a resistance reading between any two
plates is different than between the other two possible pairs of plates, it
is an indication that one coil of the armature
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Tool Test : Cordless Drill/Drivers
Our tester compares 10 cordless drill/drivers for speed, power, and performance.
By Rex Cauldwell
Publication Date: January/February 2003
As both a master plumber and master electrician, I drill more holes for pipe and wire in a day than most tradesmen might in a week. It seems like I've got a drill in my hands most of the day, and more often than not it's a cordless tool. Using cordless drills improves convenience, safety, and speed for most of my jobs, and unless I'm drilling large-diameter or very deep holes, my cords stay in the van.
Test Criteria
Tool manufacturers sell the most cordless drills in voltages between 14.4 and 24. For my needs,
14.4-volt models are a little underpowered and 24 volters seem a bit heavy, so I tested 10 tools with batteries of 15.6, 18, and 19.2 volts. I tested the Hilti SF 150-A and Panasonic EY6432GQKW 15.6-volt tools. At 18 volts, I tested the Bosch 33618, Craftsman 27124, DeWalt DW987K-2, Hitachi DS18DVB, Makita 6347DWDE, Metabo BST18 Plus, and Milwaukee 0622-24. I also tested the lone 19.2-volt model, the Porter-Cable 9984.
I tested the tools on my jobsites and then in my shop running some speed and duration tests. I compared each model's balance, weight, and comfort. I also evaluated how easily I could reach and operate the switches. But the two most important test criteria for me were chuck quality and the number of holes I could drill at high and low speeds.
Design Features
A tool that's easy to move and position makes a big difference over time, especially if you spend a lot of time reaching between joists to sink holes. Tool size, handle thickness, balance, battery exchange, and battery orientation all affect a tool's feel. So do placement and movement of switches.
Size. Compact tools can feel lighter....
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Table Saws
Posted by: Admin on Friday, September 30, 2005 - 05:18 AM (786 Reads)
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A table saw is one of the most popular pieces of machinery used for woodworking. It consists of a circular saw powered by an electric motor that is mounted onto a table. In order to cut, material is pushed through the saw on the top of the table. It is used mostly for large wood projects such as fences, tables, book shelves, etc. When selecting a table saw it is important to know the different types and the pros and cons of each. The following are the four basic types of table saws and what they have to offer.
Bench top Saws
The bench top saw, also known as the portable saw, does not come all the way to the floor but is meant to be placed on top of a table for support. This is the more lightweight version of the table saws. They usually can be carried by one person from job to job.
The bench top model is preferred for those who are looking for a table saw that is portable and less expensive; however, remember that you always get what you pay for. The bench top saw has the least amount of capability out of any of the table saws. With the decreased size and weight of the saw, it is less durable and there are greater restrictions of the size of projects one can do.
Contractor Saws
Also known as the open-stand saw, the contractor saw is heavier and more durable than the bench top saw. Its circular saw is mounted on a heavy table with an open set of legs. This type of saw is usually preferred for those who have a tool shed at home since it is moderately-priced and does not require any extra voltage than is provided in a regular outlet. While this model is heavier and less portable than the bench top model, the contractor table saw is still usually moved from job to job (most contractor saws come with wheel attachments to make this easier).
Cabinet Saws
Cabinet table saws have the circular saw attached to a table with a cabinet. It is the largest and the heaviest of the table saws and therefore is not moved around like the other table saws. The cabinet table saw is more durable and has less vibration which makes for a smoother cut. However, the cabinet saw is more expensive than the other types of saws and usually requires the installation of a heavy circuit. The cabinet saw also has a height and tilt adjustment feature and has better dust collection than the other models.
Hybrid Saws
A hybrid table saw is a lot like the contractor saw with a few key differences. For one thing, it is much more compact than the contractor saw and does not require as much room in your tool shed. The hybrid table saw also offers some of the features of the cabinet saw. With its solid and heavy base, it has the lower vibration of a cabinet saw along with dust control. A contractor saw or a hybrid saw of good quality suits the needs of most woodworkers.
The cabinet saw, contractor saw, hybrid saw, and bench top saw are...
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The cordless impact wrench is quickly gaining in popularity among professional mechanics and the hobby mechanic as well. You may be thinking "I already have a cordless drill that I use for impact applications, why do I need a cordless impact wrench as well?". I thought the same thing. The first difference is on the inside. A cordless drill creates continuous in-line torque. A cordless impact wrench employs an internal spring-loaded pulsating cam to create rotational torque. This creates the "impact" force that loosens a nut. It is the equivalent to banging a wrench with a hammer to loosen a rusty nut only a lot faster. Unlike a cordless drill - which creates continuous in-line torque, a cordless impact driver uses an internal spring-loaded pulsating cam and gear mechanism to create rotational torque or the "impact" force.
Another big difference, is the lack of reactionary torque. Reactionary torque is what you experience with your cordless drill. You have to use brute force to keep ....
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Why is it so common? Maybe because people find it a basic necessity. For example, if you want to put a a frame, will you call the carpenter? My father would not, because he can properly use a hand drill!
I've seen him. What you do is; first fix a small bit...
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Chopping Wood
Posted by: Admin on Tuesday, August 16, 2005 - 08:35 AM (503 Reads)
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Now that the saw has been bolted to the bench, there are two other pieces to add. The first being a block of wood (2 x 4) to provide a stop for the log. This way, every log gets cut to 8". The second piece is another block of wood that helps stabilize the log. While cutting the log, it sometimes has a tendency to vibrate a bit forward. This block stops the log from moving. When operating the saw....
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Porter Cable
Posted by: Admin on Monday, August 15, 2005 - 07:16 AM (472 Reads)
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Popular Mechanics awarded Porter-Cable's Model 9884 19.2-Volt cordless drill its Editor's Choice award (February 2000 issue). Today's Homeowner named Porter-Cable's Model 9845 cordless saw as one of its Best New Products of 2000 (February 2000 issue). American Woodworker selected Porter-Cable's Model 7529 Plunge Router...
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Since this is an existing design, you might want to do some further experiments to make it more of a Science Fair experiment instead of just a model. Here are some suggestions:.....
All types of armatures and motors- including cylindrical- are availaable at Zoher Hardware.
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Career Information Technicians have the ability to install, program, and repair robots and related equipment, such as programmable controllers, robot controllers, end-of-arm tools, conveyors, and parts orienters, applying knowledge of electrical circuits, mechanics pneumatics, hydraulics and programming, using power tools, hand tools...
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