The mandrel consisted of two triangular pieces of hard pine, separated by wedges attached to one piece which fitted into slots in the other; these, when expanded, practically filled the whole of the inside of the ducts.
The form and details of the expanding mandrel which was finally designed to meet the conditions, and proved so satisfactory in every way, are shown by Fig.
The mandrel used in the final rodding was made as shown at G, Fig.
The 4-way conduits were generally laid in the ordinary way, except that no laying mandrel was necessary.
The lines were rodded in both directions from alternate manholes, thus avoiding uncoupling the rods and allowing every pull to be effective in pushing the mandrel through the ducts.
Connection at Head End may be dispensed with, if the mandrel is threaded through ducts by rods attached to the trailing end.
In two instances, the mandrel became stuck in such a manner that the duct line had to be cut into in order to take it out.
Not many obstructions were met, and these were usually some stray laying mandrel which had been left in by mistake, or collections of mortar where the plastering of the single-way joints had been defective.
Very little trouble was met in rodding the power conduits, except for a few misplaced ducts, or a small mound of mortar or a laying mandrel left in.
They were laid with a wooden mandrel; a square leather washer at the near end acted as a cleanser when the mandrel was pulled through.
The mandrel itself was next put through, three or four men being used on the rods.
The mandrel and cutters were deflected and broke through the web of the ducts rather than remove this hard grout.
The mandrel is then forced in by the hammer until its lower edge has passed through the hoop.
These tools, and the screws made by them, are all inferior to those made by lathes with traversing mandrels; that is, a mandrel which slides in and out of the head stock, as in a Holtzapffel lathe.
If a mandrel runs out of truth a very little, sooner than alter it, or make a new one, they will try to “make it do.
The mandrel must be of steel, and turned to the desired pattern—like Fig.
If we have a small cylinder head to turn, for instance, the back head, which has no hole in it to put a mandrel through, as the front one has, the wooden chuck will come in play.
Fibrous wood such as white oak, makes a good mandrel, for the reason that work, driven on it, compresses the fibers instead of scraping them, so that the size of the mandrel is unchanged.
It can be made eccentric with the mandrel of the lathe, if desired, so as to turn a piece on one side, or drill in a similar manner in the end of a plug.
The mandrel must be as much smaller than the size of the finished work as will allow it to come off freely, for it will be apparent that if the work was spun up on the mandrel, it could never be taken off.
In lathes that have traversing mandrels to cut screws, the tool itself remains stationary, but as this is obviously a disadvantage in many kinds of work, it is far better to have the tool advance and the mandrel revolve as usual.
This gives four sharp corners, so that, when driven in the end of a block, it will not slip; three small screws will hold the plate to the mandrel so that it cannot get loose.
Mandrel lathe, a lathe with a stout spindle, adapted esp.
Saw mandrel, a mandrel on which a circular saw is fastened for running.
Defn: Drawn out from a heated solid bar, as by a process of spiral rolling which first hollows the bar and then expands the cavity by forcing the bar over a pointed mandrel fixed in front of the rolls; - - said of a weldless tube.
This mandrel is journaled in a hinged frame supported by a block replacing the tool post, and is adjusted as to height by a screw passing through an arm projecting from the supporting block.
The cylinder and piston are made from mandrel drawn brass tubing, which may be purchased in any desired quantity in New York city.
This device consists of a mandrel carrying at one end the cutter and at the other end a large pulley.
Is there any practical and effective method known for cutting screws by connecting the slide rest with the mandrel of the lathe by gears or otherwise?
A pulley is fixed to the middle of the mandrel and the latter is threaded on the ends; an emery, or a carborundum wheel is slipped over each end and these are held in place by washers and nuts.
The inner end of the mandrel projects beyond the bearing and this is threaded so that a chuck, that is a device with adjustable jaws for holding the work, can be screwed on it.
It consists of a bed supported on a frame which carries the driving pulleys; the latter in turn is belted to a cone pulley which is keyed to the mandrel and this runs in bearings in the headstock.
This swivel turns in these holes; and it is itself perforated with a round hole just large enough to receive freely the body of the mandrel F G.
This mandrel has now on it the cylinder, which is to be taken off.
The cutter mandrel is placed in the centers of the lathe, or should the lathe head be raised, a short mandrel with the cutter near the end can be placed in a chuck, and adjusted to run true.
When the cutter A, which is in a mandrel placed in the centers of the lathe, has finished a cut for a tooth, the pawl is disengaged and the mandrel turned to another tooth in the clock wheel.
The pawl is released and the mandrel turned to the proper number of teeth and the operation repeated.
A small attachment can be made to fasten in the tool post of a lathe and the attachment made to take a mandrel on which to place the blank for cutting a gear.
When themandrel is put in between the centers a small pawl is fastened with a screw to the frame with its upper end engaging in a tooth of the clock wheel.
Then with the hammer the iron is gradually worked cold about the mandrel as at E until the perfect form is acquired.
The piece is placed on a mandrel and turned to 3/4 in.
The final operation in shaping the ring is by driving the protruding cut, lip down, to the common level of the opposite point, thus giving us the finished ring with the lips closed on the mandrel as at J, Fig.
A wood mandrel with a metal shaft to turn in the centers of a lathe was made to fit the bored-out cylinder.
There are some half circles in this pattern and these are framed by shaping the same about the mandrel with the hammer.
The blank wheel is put on the outer end of the mandrel and a clock wheel having the number of teeth desired placed on the other end.
The arbor or mandrel on which a circular saw is driven.
Indeed, if these holes F have been accurately bored, a neatly fitting mandrel passed through them should hold the side frames true.
The planing, both of the lathe shears and of the heads, being done as accurately as possible, the heads are provided with a mandrel or arbor, to the end of which is secured the device shown in Fig.
The collar on the saw arbor should be slightly hollow, so that the saw will be gripped around the outer edge of the collar, and the arbor or mandrel should be level so that the saw will stand plumb.
The small end of the mandrel is thus the standard of its size, and the wear of the collar gauge is in the same direction as that of the reamer.
In a very small cover the gland hole may have a mandrel fitted to it and be turned therefrom on both radial faces, or on one face only, the other being turned at the chucking at which the holes were bored.
One end of the mandrel has a check, that the brass joint may not prevent the worm from lying flat on the mandrel.
The projecting ends of the mandrel are supported to allow the worm to lie quite clear.
A small flatmandrel being introduced into the hose, the new rivets are put into the leather, and riveted up the same as new pipe; the mandrel is then shaken out at the end.
If the small mandrel be not used the heads of the rivets are apt to lie unequally on the worm.
The leather is then put over the worm, and the rivets being put into one side, a small thin mandrel is laid over the canvas and the rivets struck down upon it.
The mandrel should be made slightly conical in order to facilitate withdrawal.
If a tube is heated by means of a long, flat-flame burner, the softened tube may be wound on to an iron mandrel which has previously been covered with asbestos.
Exceedingly good graduations may be made by the edge of a small, thin, abrasive wheel which is mounted on the end of a small mandrel and driven by a flexible shaft from an electric motor or any other convenient source of power.
Such cones should be mounted on a mandrel which will fit into the chuck of the American hand-drill and turned on the lathe to the desirable angle for stoppering.
To have a circular saw run well, should the mandrel have a little end play if it is desired to relieve the saw and guides of strain?
If the saw is not true or the carriage runs crooked, end play of the mandrel to the extent of the deviations will relieve the strain upon the saw.
But if the carriage runs true and the saw true, the mandrel should have no end play.
As the mandrel with the ferrule passed through the tin, the metal was shaped exactly to the mandrel.
The mandrel was then removed, the ferrule was placed on it, and both then started in the hole made in the tin and driven through it.
Illustration: A Wood Mandrel Used to Face the Ends and Turn Flanges on Tubing for Cylinders] A Pocket Direct-Current Voltmeter The assembled drawings of a very simple voltmeter are shown in Fig.
The point of the mandrel was driven through a piece of block tin, about 1/2 in.
In this case, the casting would also be held by pressing a mandrel through the hub; as shown.
The uniformity of the distance x at each end is then tested by placing the mandrel upon the offset centers and rotating it, by hand, with a dial indicator in contact at first one end and then the other.
After the reaming operation, the casting is removed from the chuck and a taper mandrel is driven into the hole for turning the outside of the piston.
Press for Forcing Arbors into Work] Some shops are equipped with power-driven mandrel or arbor presses.
This mandrel should run true on its centers, as otherwise the outside surface of the piston will not be true with the bored hole.
For planishing pipes or tubes a long wrought iron mandrel is provided mounted on two cast iron carriages, each having four flanged wheels for running on rails.
A pallet is fastened on the top of one of the mandrel carriages, Figs.
A plumber's joint having been made, themandrel is drawn by the chain through the new length, obliterating any dents or malformations in the interior.
It may most easily be described as a circular plate which screws on to the inner end of the mandrel (the spindle imparting motion to the object being machined) and has in its face three slots radiating from the centre at angles of 120 deg.
When a length of piping is added to the line, a chain is first passed through it, which has at the end a bright steel mandrel just a shade larger than the pipe's internal diameter.
For example, the rubber is squirted out of a mammoth tubing machine in the shape of a huge tube, then slipped on a mandrel and vulcanized.
The old fashioned way of making jar rings was first to take a large mandrel and wrap it around with a sheet of compounded rubber until the thickness of the ring was secured.
Instead of heating strips of metal and welding the edges together, tubes may now be made seamless by rolling the heated metal around a solid heated rod; or by placing a hot ingot in a die and forcing a mandrel through the ingot.
Rest it on top of or against the back of the saw mandrel and shape the forward edges of the teeth on a line with the upper side or rear side of the straight edge.
They are made in pairs and are attached to the ends of a mandrel supported by a metal stand which is bolted to a bench.
The traversing mandrel is of the best quality of steel, and the machine is otherwise made of iron in a substantial manner.
The mandrel is driven by belt from a cone pulley of three faces, which gives the proper speeds for different sized bits.
The mandrel which carries the chuck is made to traverse by a foot lever, so as to bore any depth up to twelve inches.
The saw is driven by a wooden eccentric placed on the saw mandrel shown in Figs.
A very small grooved pulley is fastened to the mandrel and surrounded by a rubber ring which bears against the face plate of the lathe, as shown in the engraving.
It may then be placed upon the mandrel and turned true, and it is well enough to make it a little thinner in the middle than at the periphery.
The shank of the cutter is fitted to a hole in the mandrel and secured in place by a small set screw.
The saw mandrel is supported between the centers of the lathe, and the saw projects more or less through a slot formed in the table.
The saw table has an inserted portion, C, held in place by two screws which may be removed when it is desired to use the saw mandrel for carrying a sticker head for planing small strips of moulding or reeding.
The mandrel is of the same diameter as the cutter, and serves as a guide to the pattern which carries the work to be operated upon.
It consists of a brass frame, F, supporting a small mandrel turning at the top in a conical bearing in the frame, and at the bottom upon a conical screw.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "mandrel" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: arbor; axis; fulcrum; gudgeon; hinge; hub; nave; pin; pintle; pivot; pole; radiant; spindle; swivel
