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Adjustable Reamers


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  #1  
Old 12-20-2008, 12:01:35 PM
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Question Adjustable Reamers

I would like to know the capabilities and limitations of adjustable reamers. Can the blades be sharpened or replaced?
How much of a cut are they designed to take in bronze and steel? When boring a hole to be reamed, how much should be left for the reamer? My current projects require @ .002" lube clearance on pivots, kingpins, mower deck wheel plain bearings etc. The hit and miss tractor project will include linkages, bell cranks, and pivots. Not critical high speed stuff, but I'd like a better fit than the next closest drill size up in the index gives, and I don't want to have to buy a reamer for every size that comes up. I have a boring head to do the pieces I can get on the mill, and a small lathe for others, but there will be plenty to do by hand in assembly.
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Old 12-20-2008, 12:06:25 PM
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Default Re: Adjustable Reamers

Rex:

I found a set of Chinese 1/64" increment reamers from 1/16" to 1/2" at Zolfo one year that do me well. They were cheap and are close enough (a few tenths either way) to work for me.

I've never used an adjustable reamer but have been known to use a brake cylinder hone on bushings, etc. to get that last thousandth or so out so the fit is just right (a bit on the tight side that will wear in). Just make sure to scrub the carborundum from the bushing after doing the job.

Take care - Elden
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Old 12-20-2008, 02:59:49 PM
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Default Re: Adjustable Reamers

Most useful of auxiliary tools!

We picked up a very nice set at a college sale, 3/8" up to 1-1/4" over about 12 reamers.

Yes, the blades can be sharpened, and I believe new ones can be bought as well. favourite trick is to break one of the four blades after getting the reamer jammed....

Just sawing up our upstairs floor, putting 1" ply down to replace the old 5/8" with Cork tiles stuck on that the previous owner liked for some reason.

The van is loaded with 25 new sheets of 1" ply that we went down to the Smoke this morning to collect.

Peter
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Old 12-20-2008, 03:03:30 PM
Skip Landis Skip Landis is offline
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Default Re: Adjustable Reamers

adjustable reamers are designed to take very small amounts at a time. .001 at a time max. they work well if you are patient. hard to get started straight without a pilot. skip
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Old 12-20-2008, 03:04:45 PM
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Default Re: Adjustable Reamers

They aren't meant for removing large amounts of material and if you are doing a number of pieces do them all at the same setting. Don't be thinking you are going to save some time by getting the first one RIGHT and then doing more expecting the same result.......
The result will be you have only one that's right.......the first one.......
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Old 12-20-2008, 03:52:57 PM
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Default Re: Adjustable Reamers

[QUOTE hard to get started straight without a pilot. skip[/QUOTE]

A pilot for these?
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  #7  
Old 12-20-2008, 05:42:36 PM
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Default Re: Adjustable Reamers

Ya I Got a set of those... Do I like them...???? No... Not Really.... Hard to keep straight... Want to catch all the time and take too big a bite.... Work a Lot Better in Brass or Bronze than Iron.... Maybe the set I have was Just Too Cheep...???

Whenever possible I prefer the Lathe or Boring head...

Ya.... I've been Guilty of Eldens Brake Cylinder hone Also...
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Old 12-20-2008, 06:49:32 PM
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Default Re: Adjustable Reamers

Forget sharpening, replace the worn out reamer. Yes boring is better but sometimes the part cannot be put into a lathe or mill. As with any reamer you want to only have to remove a few thousandths of material. A good set of letter, number and fractional drills will also be good to have so you can get the hole just a few thousandths under size before you even try to use any reamer. Slow speed and lots of cutting fluid are also required for the best results. On small holes retract the reamer often to remove chips.

Forrest A
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Old 12-20-2008, 09:15:54 PM
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Default Re: Adjustable Reamers

All things considered, I may get a set of +.001 chucking reamers for 1/4", 3/8", 1/2", 5/8", 3/4". Due to inexperience and hand held operations I'll probably have a result closer to +.002 anyway.
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Old 12-21-2008, 12:02:52 AM
Tom Martin Tom Martin is offline
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Default Re: Adjustable Reamers

I have a good bit of experience using the adjustable reamers of the type shown for removing choke in shotgun barrels. Sometimes I only had to remove a few thousandths, and other times I had to remove 0.030" or more. I bought the first ones from Brownells gunsmith supplies, and they were English made. I bought replacements from MSC and they were Chinese made but better finished and better working, plus cheaper. They worked real well so long as you never tried to take out more than one or two thousandths per pass, and kept them lubricated and clean.
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Old 12-21-2008, 01:04:21 AM
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Default Re: Adjustable Reamers

Yes Rex, there are pilots for those reamers. We have a set that dad bought many years ago with pilots. An extension threads on to the exsposed thread and a cone slides over it to center it in the opposite end of the hole. Very useful for reaming kingpin bushing and other inline holes.
I will get pictures of them and post them here, should make it clearer than my explanation.
PT
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Old 12-21-2008, 05:16:47 AM
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Default Re: Adjustable Reamers

We also use ours for the occasional "not so obvious" jobs, like taking powder coating out of a pivot bush on one of the engine trolley frames, things like that, or opening up valve guides or bushes.

Our set is very similar to the one pictured, our lid slides off the base.

Peter
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Old 12-21-2008, 09:33:26 AM
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Default Re: Adjustable Reamers

One thing I haven't seen posted is to never turn them CCW. Always in CW direction even when removing from hole. There is no support for cutting edge when turning backwards & are quickly dulled or chipped.
I have several sets some with pilots. I don't use them often but they are certainly handy to have. I bought a 5 gallon pail with about 8 large adjustable reamers(up to 2 7/8") at a yard sale for $5. I've only used one of these but that hole was worth several times what I paid for all.
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Old 12-21-2008, 10:06:50 AM
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Default Re: Adjustable Reamers

I use them to finish the throttle shaft bushings I install in carbs. The bushings are made of oilite bronze. I have made pilots in order to keep both sides lined up. When they get dull I pitch them and replace. I normally do about a dozen carbs at a time. The throttle shafts are turned down to remove wear and the bushings are a bit undersized. I sort the shafts by size, smallest first. I open up all the bushings a little at a time untill the smallest shaft fits. I set that carb aside then continue opening up the ones that are left untill the next larger shaft fits. This way I only need to step the reamer through it's adjustment range once and if I mess up and make a hole too big I have larger shafts to try. I increase the hole size by about .001" at a time.

I have not seen replacment blades and by the time the blades are dull the adjustment bits are pretty well shot.

keithw
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Old 12-21-2008, 04:54:52 PM
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Default Re: Adjustable Reamers

Here's the pictures of the reamers with the pilots.
The next to largest one is a replacement from a different manufacturer. The pilot and reamer body are one piece instead of the pilot threading onto the body, works just as good.
Happy reaming and Merry CHRISTmas to all.
PT
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Old 12-21-2008, 06:14:25 PM
Richard W. Richard W. is offline
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Default Re: Adjustable Reamers

These adjustable reamers are not a good replacement for regular reamers. They will get you by in a pinch, but the holes are not really round or to size. The best reamers have a left handed spiral on the flutes and don't chatter like the straight fluted ones sometimes tend to do.

Richard W.
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Old 12-21-2008, 08:14:27 PM
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Default Re: Adjustable Reamers

Paul, could you please post a picture of the instructions from the Sears set? Interestingly, they give directions for sharpening as well as for use. These old tools often have excellent, concise directions.

As for sharpening, I suppose one could make up a jig for holding the set of blades on a surface grinder.

I hadn't known that the knurled tapered thing was for piloting. I only have one on one of my reamers, I guess they get lost.

Five dollars for a bucket of big reamers is a pretty good score! It's pretty hard to find machine tools at garage sales.

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Old 12-21-2008, 08:20:15 PM
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Thumbs up Re: Adjustable Reamers

Quote:
Originally Posted by Richard W. View Post
These adjustable reamers are not a good replacement for regular reamers.....
I'm putting together an order for the sizes I need. Not that many at this point, and I found that I have 3 of the ones I need already.
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Old 12-21-2008, 10:50:16 PM
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Default Re: Adjustable Reamers

Here's the instructions, hope they come through readable.
PT
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