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10-01-2009, 06:33 AM #1
Hardinge HLV-H inch/metric - clarify thread possiblities
1. Will the standard HLV-H cut metric threads via change gears ?
2. Does the inch/metric model (HLV-EM) require any change gears for any of the thread possiblities ?
Guess what I'm getting at is, is the inch/metric model simply more "convenient" or does it have more thread pitch possiblities period ?
Of course I could figure this out on my own by reading the brochures...but I'm feeling lazy today and you guys need something to talk about anyway...
10-01-2009, 07:17 AM #2
Dang, I thought you guys would hop right on this...but since not, you "forced" me to look at brochures and manuals ! According to Hardinge HLV-H manual you have to buy a special metric attachment and then you can do 34 different metric pitches. I can't find a Hardinge HLV-EM brochure but I've got a Feeler "copy of one" brochure and it shows 36 different metric pitches on the thread box data plate.
So I guess the bottom line is the EM is mostly just more convenient, and does do a whopping 2 more pitches.
10-01-2009, 08:18 AM #3
Note that you can still use changewheels on the end of the metric box for those threads that the brothers Hardinge didn't think of.
10-01-2009, 08:29 AM #4
The metric gear box is required for the HLV-H. It costs about $970. The gear
box set comes with a few gears so you can do a few standard metric threads,
M0.5, M1.00, M2.00. Since every HLV-H installation probably has a few more
gears lying around you can probably get M1.00 and M1.25. For most of the
rest of the 34 pitches you need to purchase additional gears if they are
not in your existing set.
Don't ask how I know the price. The good news is that you can move the metric
gear box to any other HLV-H or HLV (dating back to more than 50 years).
10-01-2009, 08:45 AM #5
10-01-2009, 09:01 AM #6
30 tooth = $64
60 tooth = $83
24 tooth = $64
66 tooth = $161
Before you call the factory do whatever it is that gets you nice and relaxed,
like a glass of beer or a hot bath. Then get ready for the prices.
10-01-2009, 09:10 AM #7
Wait. You're telling me I can retrofit my HLVH for metric,
for a thousand dollars??
Or am I missing something here.
10-01-2009, 09:42 AM #8
At a genuine market exchange rate (instead of the normal 1$==1£ used for most things) That's about the same price that Myford charge for an ML7 gearbox, a much less substantial lump of metal
10-01-2009, 10:35 AM #9
That was just the question a customer was asking for the HLV H I have for sale
Anyone can provide me with the metric threading data and the pitch of the gears ???
Also a picture with some sizes for the mount for that gears would help
Peter from Holland
10-01-2009, 11:22 AM #10
All the gears will be 22/29DP stub form, 20° PA
One could substitute another close pitch for changewheels (20 or 24 DP or 1Mod or 1.25Mod) if a large number were not already available, since the Hardinge gear form is not at all common.
For the changewheel/thread tables, look at the HLV manual on Hugh Sparks website:-
10-01-2009, 11:39 AM #11
99% sure the HLV-DR I had would cut metric threads direct. IIRC, it had a knob to select inch or metric. I never cut any metrics on it, but George used to come over to do his metric threads.
10-02-2009, 08:07 AM #12
10-02-2009, 08:08 AM #13
10-02-2009, 05:18 PM #14
and horizontal milling adapter and cutters. I would also need a way to index the
blank for cutting gear teeth. I have great praise for a company like Hardinge. Somebody
can go out and buy a machine that is half a century old and there are still brand new parts
made for it. Incredible when you think of that.
10-04-2009, 04:00 AM #15
10-04-2009, 09:01 AM #16
OK, new question. So when one sees an HLV-H where the box to the far left that contains the change gears is a different shape than the standard box, that is because it's set up for metric gears ? So for about $1,000 one gets this new larger box and the gear yoke...or just the gear yoke ?
Does below photo show the optional metric box ?
10-04-2009, 09:12 AM #17
The gear box set comes with a nice box with door. A 127 tooth gear, two or
three other gears and a banjo (for mounting the gears). I think it's called a
banjo. In my case the sent me a second banjo. I think the Hardinge threading
system is the best ever made that goes on a manual machine. Every time I messed
up on a thread cut it was my fault, never the machines fault.
The above photo does show the metric box installed.
There is a time expenditure involved when the metric banjo is installed and you
decide to switch over and run a English thread. The metric banjo has to be removed
to enable the shaft for the English gear cutting gear train to move to the left.
10-04-2009, 09:19 AM #18
10-04-2009, 09:37 AM #19
I have threaded imperial threads on an HLV-H w/ an imperial leadscrew and am familiar w/ the slick Hardinge retractable toolpost. But it was 15 yrs ago...
But what is the metric threading sequence on an imperial HLV-H w/ metric gears? Halfnuts have to remain engaged?
Does the metric threading procedure differ at all whether its an HLV-H or HLV-H-EM?
Last edited by morsetaper2; 10-04-2009 at 10:45 AM. Reason: added "15 yr" note
10-04-2009, 09:44 AM #20
to removed the "1st" gear and the metric banjo. I think the metric box looks cool.
Another advantage to a box with a door is that you can apply grease to the gears.
The internal English gears are not that easy to get at and people neglect the lube job there.
A lathe like a Graziano with a gear train bathed in oil is the ticket.