paul mcclintic
7:33am? ?
On Thu, Feb 29, 2024 at 08:31 AM, OldToolmaker wrote:
"Machinerys HandBook” has all the data you need
I have one but it only tells me the keyway info, but nothing that I found about clearance that should be used for the width of the guide slot
I think looking for number.? "Machinerys HandBook” could take days to find. The book one is 1930s and 1940's? easy to find information.? I have books from the 1941 to 1980's and have read the 1930s too.? The number is max 0.000,5 oversize upto ?" keyways. Most my work was 3/16" and 1/4" keyway few small keyway too.? When I was single I purchased this had money too.? 
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On Thu, Feb 29, 2024 at 08:31 AM, OldToolmaker wrote:
"Machinerys HandBook” has all the data you need
I have one but it only tells me the keyway info, but nothing that I found about clearance that should be used for the width of the guide slot.
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“Macherys HandBook” has all the data you need. I think the book may be available online.
Dick
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Samd as a keyway..
My self a motor driven would nice. The could use internal gear making. About stroke you need a max of ?"? would do most hobby work and keep thd hp of motor down.
Dave?
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The depth I can calculate but I don't know how much clearance I should use for the width of the slot.
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You can speed up the process by fitting a scrap plug in the bore & drilling a slightly smaller than desired key size hole, centered at the plug/bore intersection.
Despite having a pretty comprehensive set of broaches, we'd still have to use a lathe as a shaper for some repair jobs on a major free world navy ship;-)
Roy
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Here is a YouTube of using a lathe to make an internal keyway.
You just use the carriage as the "reciprocating ram" that would be on a shaper.
I've never done it, and the example seems to be with aluminum which probably makes it a little easier.? Steel or similar might be a little more difficult, or at least take a lot more of those little manual cuts.
Charles E. "Chuck" Kinzer
On Wednesday, February 28, 2024 at 05:26:55 PM PST, Miket_NYC <mctaglieri@...> wrote:
Someone explained that you can easily do it on the minilathe by using it as a shaper. So why go on about buying gadgets (let alone gadgets that cost $160!)
We all have minilathes, so I suggest you forget about these and do it on your lathe.?
Mike Taglieri?
On Wed, Feb 28, 2024, 5:28 AM paul mcclintic via <cannontandem= [email protected]> wrote: On Tue, Feb 27, 2024 at 08:35 PM, davesmith1800 wrote:
Here lower cost set in metric.??
The set you show is $160 and does not include a 4mm broach. I bought the 3mm and 4mm broaches for $30. I need to make the one guide since there is no 28mm guide for a 4mm broach. I have the guide blank made but need to know how much clearance I need for the slot. The 4mm broach is 0.2533" (6.434mm) wide. I was hoping someone would have a 3mm and 4mm guide to measure. Thank you for all the replies.
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Someone explained that you can easily do it on the minilathe by using it as a shaper. So why go on about buying gadgets (let alone gadgets that cost $160!)
We all have minilathes, so I suggest you forget about these and do it on your lathe.?
Mike Taglieri?
On Wed, Feb 28, 2024, 5:28 AM paul mcclintic via <cannontandem= [email protected]> wrote: On Tue, Feb 27, 2024 at 08:35 PM, davesmith1800 wrote:
Here lower cost set in metric.??
The set you show is $160 and does not include a 4mm broach. I bought the 3mm and 4mm broaches for $30. I need to make the one guide since there is no 28mm guide for a 4mm broach. I have the guide blank made but need to know how much clearance I need for the slot. The 4mm broach is 0.2533" (6.434mm) wide. I was hoping someone would have a 3mm and 4mm guide to measure. Thank you for all the replies.
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Re: Mexican users of 7x12 lathe
When I cutting cast iron I use lathe and cut outside.? The photo is casting in class 45? cast iron. It is a harder cast iron than most.? FYI? The first photo is finished part. The second photo same wheel be machined. I took the photo not in the photo.  
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I have made about three of these guides and they worked. So I believe that makes me a psuedo-beginner-expert by you-tube standards. :)
The slot for the broach needs to be cut such that the portion below the first tooth clears the work piece but the first tooth will cut. I can measure the ones I made if you are interested, but I don't know what the depth for a commercial guide might be.
Tom
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Re: Mexican users of 7x12 lathe
Yes, an angle grinder is a great idea. (I think I've actually done it that way before, but I forgot to mention it!)
There are two real problems with using barbell plates. The skin is the worst one. The second problem is a barbell plate always has a hole?in the middle, obviously. That's fine for making chuck backplates and similar round, hollow things, but it's a drawback for many other projects.
Mike Taglieri?
When I use barbell weights, I clamp one to a sawhorse (outside) & use an angle grinder to remove the skin before putting it on the lathe.
Roy
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On Tue, Feb 27, 2024 at 08:35 PM, davesmith1800 wrote:
Here lower cost set in metric.??
The set you show is $160 and does not include a 4mm broach. I bought the 3mm and 4mm broaches for $30. I need to make the one guide since there is no 28mm guide for a 4mm broach. I have the guide blank made but need to know how much clearance I need for the slot. The 4mm broach is 0.2533" (6.434mm) wide. I was hoping someone would have a 3mm and 4mm guide to measure. Thank you for all the replies.
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Re: Mexican users of 7x12 lathe
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On Tue, Feb 27, 2024 at 10:06?PM Johannes < johannes@...> wrote: Thanks Mario and the rest of your boys. I found in map this Lapaloma Metal not so far away from me. Let see they sell seizes shorter than 3 meters. Brass and aluminum is for the moment most interested. ? And my second question: Somebody knows I can find in Mexico a similar “Little machine shop ?5100” lathe? ? /Johannes ? ? ? ? ? Mexico, San Miguel de Allende, so nowhere close. Look for "Metales la Paloma" for alum & brass. They do have minimums but not outrageous. ? On Tue, Feb 27, 2024 at 9:19?AM Johannes <johannes@...> wrote: Hi
I want to meet Mexican users of 7 x 12 mini-lathe.
I live in México City, however,I don't speak Spanish. ;)
First of all I need info where to go to get metal.
/johannes
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Re: Mexican users of 7x12 lathe
Thanks Mario and the rest of your boys. I found in map this Lapaloma Metal not so far away from me. Let see they sell seizes shorter than 3 meters. Brass and aluminum is for the moment most interested. ? And my second question: Somebody knows I can find in Mexico a similar “Little machine shop ?5100” lathe? ? /Johannes ? ? ? ?
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From: mario mohlSent: tysdag 27. februar 2024 11:44 To: [email protected]Subject: Re: [7x12MiniLathe] Mexican users of 7x12 lathe ? Mexico, San Miguel de Allende, so nowhere close. Look for "Metales la Paloma" for alum & brass. They do have minimums but not outrageous. ? On Tue, Feb 27, 2024 at 9:19?AM Johannes <johannes@...> wrote: Hi
I want to meet Mexican users of 7 x 12 mini-lathe.
I live in México City, however,I don't speak Spanish. ;)
First of all I need info where to go to get metal.
/johannes
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there's several of these on youtube
animal
On 2/27/24 6:05 PM, paul mcclintic via
groups.io wrote:
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I am putting a 4mm keyway in a 28mm bore. I do not think buying
one is an option.
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Here lower cost set in metric.?? 
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I am putting a 4mm keyway in a 28mm bore. I do not think buying one is an option.
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Re: Mexican users of 7x12 lathe
When I use barbell weights, I clamp one to a sawhorse (outside) & use an angle grinder to remove the skin before putting it on the lathe.
Roy
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Hello, Paul!
There is an easy method of cutting internal keyways that does not require a broach.
Have you considered using your lathe as an internal shaper?
All it requires is a boring bar smaller than the hole in your gear.?
It only requires you to grind a tool bit the width of your intended keyway. Then center the boring bar in the bore. Then you cut the keyway slot with a back and forth motion until the keyway is to depth. Keyway Done! And no expense.
Dick
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Re: Mexican users of 7x12 lathe
"If you don't mind mediocre material, exercise weight plates can give some cast iron slugs."??
You can get a lot of good metal from people throwing out barbell equipment (usually after the person in the family who bought it has moved out, given up bodybuilding, died, or whatever). So look around on garbage-collecting days. The bar itself is usually a five foot length of 1" 1018 mild steel or similar, and it's perfectly usable.
The plates are normally cast iron (but cheap ones are plastic-coated concrete. Leave those for the trash). There's a thick skin you have to get through when turning barbell plates, but after that the metal isn’t so bad, in my opinion. I've? found you can get through much of the skin by sawing the outside off with a hacksaw or filing with a file that you don't much care about (because it's very abrasive).
I've made backplates for chucks out of barbell plates. You drill and tap the plate in areas that will be unused or cut off and bolt it to the lathe faceplate. Then you machine the center to fit the lathe spindle. You then attach the plate to the spindle by the center section you made and cut off the waste. Finally, you machine the other side to fit the back of the chuck.??
This is a good beginner's project in my opinion. If you screw it up cosmetically, no one's ever going to see it but you. And if you totally trash it, you've only ruined a barbell plate you found in the garage.
But beware: the standard minilathe motor doesn't have nearly enough power to turn a cast iron disk, because you have to turn it SLOWLY. So make a spindle crank or beef up the motor first.??
Mike Taglieri?
I'm in a very rural part of the US.? Not much in the way of scrap yards or metal purchases that aren't an hour+ drive.
I tend to scrounge from other sources.? For example, if you find an old rear end/differential, you can get some nice slices out of the axle tube and the axles, plus the flanges.? Some of the stuff is heat treated so that can be an issue machining.? If you don't mind medicore material, exercise weight plates can give some cast iron slugs.? Some items at places like Harbor Freight are cheap enough to be worth buying and then just using for metal sources.
Aluminum, at least for me, tends to be hard to find as it gets scrapped so readily and for that reason, brass and copper is really difficult to find.? Sometimes I just buy brass fittings that are close enough to machine down even though it's an expensive approach.? I've got a local hardware store that still has a lot of brass fittings.
On Tuesday, February 27th, 2024 at 11:04 AM, davesmith1800 < davesmith1@...> wrote:
Even in American that can be hard to to find.
I would look at Amazon and Walmart.
Back in 1960's you could goto scrap yards but now machine shops buy 6" bar stock too.?
Dave?
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davesmith1800
OldToolmaker
Johannes
