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Boring Head For Sherline Mill

tomw

Active Member
Active Member
#1
Dear folks,

I really don't like the Sherline boring head that I have. I find it very difficult to adjust precisely. Thus, I am looking for either a new boring head or tips on adjusting the Sherline head precisely.

If put in list form, my questions are:

1) What is the best way to use the Sherline boring head for precision boring?

2) What alternative are available?*

*On this forum, I have seen reference to the Criterion S-1-1/2A. An interweb search found no such part number. Any ideas? If I'm being an idiot, please point that out. I can't stop being stupid without help.

Thank you,

Tom
 

mikey

Active User
H-M Supporter-Premium
#3
Tom, I own a Sherline boring head and it is a very light duty head. It does work, though, if you are careful to stay within its work envelope and account for the backlash in the screw (like most adjustable things we use). The problem for me is that I was always at the edge of that envelope so I went with the Criterion S 1-1/2A. There is no comparison between a Sherline head and a Criterion, even one as small as the S 1-1/2A. More mass, more precision and greater work envelope. In fact, you have to be sure to lower your speed when boring larger holes or your mill will walk off the table due to vibration!

The S 1-1/2A comes up on ebay from time to time and that is where I would look for one. It uses a 7/8" adapter that you can get from LMS to fit the 3/4-16 head of the Sherline mill. This is a good head but a little heavy when you bore out past 2" or more. They come in 2 versions to fit 3/8" and 1/2" shank tools and the 3/8" version is better due to the smaller mass of the boring bars.

Criterion also makes the Tinymite series, which are even smaller. The have an integral shank and so will mount with a collet. I seem to recall a very small square head they made, about the size of a quarter, but cannot remember the model number.

There are other makes/models of precision boring heads - Wolhaupter and others - but for the hobby guy a Criterion is a good choice. If you buy one on ebay the cost is not bad at all - mine cost $50.00!
 

kvt

Active User
Active Member
#4
I have the Sherline head also, and it is a little bit of a pain, and hard to adjust. But I did manage with it. I also will be looking for a diff one if I start doing more boring. My prob is I keep trying to do things that are bigger than the sherline will handle.
 

tomw

Active Member
Active Member
#5
Thank you all for the help. MSC has a Criterion for $500. I don't really do much on Ebay for tools, as I have not had much luck with quality.
 

T Bredehoft

Active User
H-M Supporter-Premium
#10
About two inches is pretty well accepted for the small boring heads, Perhaps the part No. 1 1/2 is a tip off to size.
 

mikey

Active User
H-M Supporter-Premium
#11
About two inches is pretty well accepted for the small boring heads, Perhaps the part No. 1 1/2 is a tip off to size.
Tom, on a Sherline lathe boring more than a 3" hole can be an adventure. At 3", the boring head can shake the mill right off the table! However, within those limits the S1-1/2 is very accurate and far superior to the Sherline offering. I have no regrets since owning it.
 

tomw

Active Member
Active Member
#12
Does anybody have any experience with this boring head:

https://littlemachineshop.com/products/product_view.php?ProductID=4764&category=

It certainly looks better than the Sherline product, and it is, frankly, cheap. And this worries me.

Mikey, I agree that a 3" boring head would nuts on a Sherline. But I hear that vibration is a great way to create a weight loss machine:

article-2534615-1A72C6A000000578-973_638x507.jpg

We had one of these around when I was a kid. We used to like to see who could eat a popsicle while being thrown around.

Tom
 

mikey

Active User
H-M Supporter-Premium
#13
Never used one but I'd like it more if it used smaller bars. Looks like it should do the job though, and the price is pretty nice.

Marketing never changes, right? The implication that using the machine will make you look like that beautiful creature is very clear. However, on this site we're thinking that if we pulled the belt and cranks off we could make a useful tool grinder out of that sucker!
 

tomw

Active Member
Active Member
#14
Marketing never changes, right? The implication that using the machine will make you look like that beautiful creature is very clear. However, on this site we're thinking that if we pulled the belt and cranks off we could make a useful tool grinder out of that sucker!
But look, she is being helped by an actual medical person! It must be legit!

That would be the worlds heaviest tool grinder. About 10 or so years ago we moved the machine from MN to CO. It was a joke gift for my brother's 50th. As we found out, it weighs about 400 lbs. It damn near broke the leaf springs on our 80s era suburban that we used for transporting it.

Back to the topic, I wish the boring head took 3/8" bars, as that is what I have in abundance.

Cheers,

Tom
 

mikey

Active User
H-M Supporter-Premium
#15
Maybe they should have reversed the position of the models - then it would make sense!

Yeah, I would be concerned about the centrifugal force larger bars will impart on a little mill, not to mention the cost of buying new bars for it.

I bought a Criterion S 1-1/2 on ebay once. It took 1/2" bars but I didn't notice it when I bought it - blinded by the price! When I tried it on my Sherline the shaking when boring a 2" hole was enough to worry me so I asked to send it back for a refund and was really lucky when the seller agreed. I can bore a 3" hole with the same model head and 3/8" bars, albeit slowly, which is why I cautioned you. Centrifugal forces on a Sherline make a difference.
 

tomw

Active Member
Active Member
#16
Mike,

Thanks. I will keep looking! Since my shop is currently torn apart for a remodel, I have some time...(sad face for now, happy face in a month or so).

Tom