Reboring tool

A bevel expansion ring is fitted into the cylinder which is to be rebored and the bevel pilot head acts as a centralizing device. There is also an over-sized ring which follows in the new cut thus insuring an absolutely rigid tool and perfect centering device. This new model will rebore practically all makes of automobile, marine or airplane cylinders of either the open or closed end types. A special tool is designed for Ford engines. So thanks for Armand for sharing this wonderful example of Mechanical history and for a good reminder of how tough automobile work was before the days of power tools.

So if you are ever in Norfolk, Va on a Monday, Wednesday or Friday around 3pm, stop by for our tour and you might get to see this item on display. I was born in Detroit, my father received his 1st pay check personally from Henry Ford as a newly hired engineer..

Just think of all the inventions that came about back then.. Rebores holes from 2 inch 50mm to 8 inch mm diameter in line at least 80 inches 2 meters apart. This setup is too large for most uses. Large Boring Adapter - for reboring holes 5 to 8 inches diameter. Held in the boring shaft by heavy set screws, modifiable cutters.

Fits the drill motor of your Milwaukee magnetic drill press. The powerful feed motor has a knob to adjust the variable feed rate. Works in forward or reverse.

Designed to use with any Q line boring equipment. Also fits the Q by inserting a bushing. Has auto-stops for both directions. Photo shows how a customer used the powerfeed to line bore center pin holes upside down. Photo shows how a customer used the powerfeed to line bore horizontally. Photo shows the QS with oversize adapter attached to a customers mag drill turning a rough torched hole into a finished 6 inch diameter hole.

We have 18" long boring bars. Hole was originally torch cut by customer then ground and bored out smooth. Customer photo showing how the bearing mounting plates are connected to standoffs that are tack welded in place. Notice the finished hole in the upper right. The manual feed allows you to control the pressure to save cutting bits. Or buy our automatic feed instead.

Customer's photo shows typical assembly of line bore equipment with Milwaukee magnetic drill. A chain was used to lift magnetic drill press in position. He used 3 bearings to reduce vibration of boring bar. If you look closely, you can just barely see the cabide cutting bit sticking out of the shaft next to the hole on the left side.

This bore welder system is for fast smooth perfect spiral welding in holes from 1. Does a perfect spiral weld that is very easy to bore. Click to request more Bore Welder info and prices be sent to you. It helps to have a 2nd person to assist with the setup, especially when positioning your boring bar.

Our equipment can also be used to rebore holes on machinery side frames, mounting flanges, printing press frames, steel mill ladles, bridge pivots, etc. Using two holes to repair, insert one plastic alignment cone or metal sleeve for small holes or adjustable centering tools for very worn holes against the good side of each worn hole.

The further apart the holes are, the better. If using the line-up sleeves for small holes , you can carefully wrap tape concentrically around the outer diameter of each sleeve for snug fit between the sleeve and the hole. It sounds strange but tape works. If the holes are too worn to find any of the original diameter to position the cone against, then you should use our optional centering-measuring tool set to position the boring bar.

Screw 4. Determine where riser blocks can be tack welded to connect bearing plates to equipment to be line-bored. The 4. The 2" inch riser blocks can also be used vertically with the 4. One of the bearing plates is extra long in case you want to overhang a bearing at the end of what you are boring.

This especially true of the standoffs holding the adaptor for the drill. We recommend one on each side of every hole you wish to bore unless there are more than 2 holes. This is because after welding all the standoffs in place, the welding causes the standoffs to move slightly and the bearings will be seized on the shaft therefore it will be necessary to loosen the bolts that hold the bearings to the mounting plates.

Then tap the boring bar slightly until you can slide the shaft back and forth because the welding process may have shifted things enough that the boring shaft does not want to slide through the bearings. The Adapter Base bearing position is permanent in order to protect the spindle bearing in the drill.

This is required by Milwaukee to avoid hurting your warranty. The Milwaukee Drill Motor has 2 mounting positions. You normally want the Drill Motor bolted in the position where the Drill Chuck is closer to the Drill Base but either should be OK if you have the adjustable position base. It may be helpful to loosen and retighten the drill base swivel if your mag drill has it. Be careful not to bend the boring bar when installing the magnetic drill press.

This is to help prevent the magnetic drill from injuring you and bending the shaft in case of sudden electrical power failure, such as blown fuse or someone trips over your extension cord. Set screw the cutter in position to proper dimension for cutting. For adjusting, it helps to use one of our optional Cutting Tool Positioners shown near the bottom of this webpage.

Otherwise you can use the digital caliper to measure from the tip of the cutter to the back side of the boring bar see photo. You can also adjust your cutter position with a dial indicator. Then adjust the cutter out by the amount of change you set the caliper jaw for. Then tighten the set screw in the boring bar. Less if the hole is large or if the hole is welded.

Photo shows caliper measuring height of carbide cutter. If you cant find any, WD40 will still work, but beware that cutting oils will leave an oil residue. This matters if you bore before you weld. You should remove oil residue before any welding to avoid oil hardening the weld.

Keep the carbide tool bits at low RPMs rpm for 8" dia [mm], max rpm for 5" dia [mm], max rpm for 3. If the cutting tool is fighting hard, apply less pressure, to make the carbide cutting tools last longer. Check often to make sure the drill chuck is still tight on the shank.

Vibration can loosen it. Also make sure you have a bearing located next to each hole to be rebored. Do not install more than one cutter in the shaft at a time because you could overload the drill or the shank of the boring bar. The left hand brazed carbide tools are for boring. A carbide facing tool and a carbide chamfering cutter are also included. The Borite holder with the carbide triangle insert is good for boring larger holes.

Do not rush. There is no substitute for using caution and common sense. There are usually three options to repair pivot holes on heavy equipment: 16 - Method A Holes can be welded and then bored back to the original specs.

Original Spec size is the hole diameter specified by the manufacturer such as Caterpillar to fit the pivot shaft, or if there is supposed to be a bushing, then spec size is the hole sized to press fit the bushing. Grind off or bore out galled metal first, because if you weld on top of galled metal, the weld will pull carbon from the galled metal and harden too much and you will waste many cutters and a lot of time trying to rebore the hard weld in the hole.

Same advice goes for removing old grease and oil since they can oil harden the weld. Consider For wire use 70S6 or substitute 70S2.

If welding in cast steel then use a soft weld because it will harden and be hard to bore. If boring cast steel make sure to use C2 carbide instead of the C5 we give you.

In welded holes it may help to first bore with the HSS cobalt steel cutter instead of brittle carbide to remove the high spots from hand welding. But you should use a hand grinder to grind smooth any high spots from the welds first. This method only works if the is a lot of extra room. The advantage of this method is that when the sleeve wears out you can just replace it without reboring. Then when the holes become worn out again simply replace the bushing with a new one.

An oversize bushing can be purchased from the manufacturer such as Caterpillar or are easily made on a metal working lathe. Heat treating the sleeve will make it last longer. Original Spec size is the original hole diameter specified by the manufacturer such as Caterpillar to fit the outer diameter of the pivot shaft, or if there is supposed to be a bushing, then spec size is the hole sized to press fit the outer diameter of the bushing that the shaft fits into.

Check with the manufacturer for original specifications. Oversize bushings can be purchased from a heavy equipment dealer or sometimes an industrial bearing supplier such as one at the website www.

If your holes are not too worn and an oversize bushing is available, then you can just bore to fit the new larger outer diameter of the bushing. You can freeze some bushings overnight or use nitrogen and slip them into the holes in the morning for an easy press fit into a hole that is undersized by. Beware that the bushing I. Photo shows jaw extensions mounted to a digital caliper to avoid battery failure problems we now supply dial calipers but will supply digital if requested.

You will likely need to sharpen or switch cutters at least once if it did not break. To measure the hole, use the telescoping bore gauge set or the dial caliper with jaw extensions provided see photo. The jaw extensions allow you to measure the hole diameter without removing the shaft. But the jaw extensions will change the size that the caliper dial reads by. The optional snap gauge set or adjustable threaded measuring tools allow you to measure the bore without removing the boring bar and so does the caliper extenders.

In FIG. Left-handed retainer nut 16 is shown at A and attachment aperture 28 is indicated. At B, cutting head 10 is shown in a side veiw with attachment aperture 28 indicated. Internal guide disc 12 is shown at C with attachment aperture 28 indicated. Arbor 14 is shown at D with the smooth shaft upwardly positioned and thread 18 shown downwardly adjacent arbor screw head The screw grove is shown in a top view at E in arbor screw head Three principal parts of the tool as shown in FIG.

In all illustrations attachment aperture 28 can be seen centrally aligned. The assembled reboring tool is illustrated in FIG. The positioning of internal guide disc 12 adjacent arbor screw head 20 is illustrated. Cutting head 10 is held firmly against internal guide disc 12 by left-handed retainer nut 16 which slides down over the shaft of arbor 14 and is locked down by turning along threads An embodiment for enlarged pipe or difficult applications is illustrated at FIG.

Left-handed retainer nut 16 is shown at A. Special backing washer 22 is shown at B. Multi-toothed cutting head 24 is shown at C. Enlarged internal guide disc 26 is shown at D.

The alignment of the attachment apertures 28 is shown in the various parts shown at FIG. Second, the original barrel has usually been fired quite a bit, resulting in considerable heating and cooling, which can also reduce internal stresses in the steel.

Third, the reamed-out bore may end up straighter than the original. As one example of reboring helping a barrel, a number of years ago, Dan Pedersen rebored a 7mm Shooting Times Westerner factory barrel for me. I never could get that barrel to shoot consistently, even after trying so long the throat started to erode. I tried bullets from to grains, several powders and even various scopes. While it occasionally shot a good group, they were apparently accidents, because during the next range session the same load never approached the same accuracy.

Basically the barrel produced 1. Pedersen rebored the barrel to the. With its best handloads, the rebored barrel consistently shot sub-inch groups at yards. Another rebored barrel was already on a rifle purchased at the Missoula, Montana, gun show in , where my wife and I had a table to sell our books. The two guys at the table turned out to be brothers of Jesse Ocumpaugh, owner of JES, and one of the rifles turned out to be an older Remington , originally a.

The price was so attractive, part of our book profits were transformed into yet another rifle for Johnny B. The bores on both rifles, by the way, looked beautiful through a Hawkeye borescope. I recently had a conversation with one of those guys. Rebores save money in several ways, none involving cheap techniques. The old barrel just has to be reamed to a larger diameter, exactly like a freshly drilled new barrel, and the rifling cut.

The original finish will still be there, often important when restoring older firearms to good-shooting condition. Third, the barrel fits the forend. Before retiring a few years ago, the well-known reborer Cliff LaBounty sometimes converted barrels to a very slightly larger bore.

LaBounty worked out a method for his rifling cutter to follow the old rifling, deepening it slightly. My friend Tim Crawford has a Westley-Richards double, originally chambered for the.

I had him make my.