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Broaching guides

 

I need to broach some keyways in gears for my lathe but need to make some guides. What is the width of the slots for type A and B guides?
 

What size?
I would just buy set for your work.?

Dave?
 

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

?
 

I am putting a 4mm keyway in a 28mm bore. I do not think buying one is an option.
 

Here lower cost set in metric.??
 

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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:

I am putting a 4mm keyway in a 28mm bore. I do not think buying one is an option.

 

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.
 

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
 

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=aim.com@groups.io> 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.

 

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=aim.com@groups.io> 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.

 

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
 

The depth I can calculate but I don't know how much clearance I should use for the width of the slot.
 

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?
 

“Macherys HandBook” has all the data you need. I think the book may be available online.
Dick
 

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.
 

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.?
 

If you have the broach, simply measure it's width (not the same as keyway width) and cut a channel to give a close fit - maybe a few thousandths larger.?

I have a 1 ton press from harbor freight to push the broach through. It can apply enough force to cut a keyway in steel, but it doesn't open quite far enough for the broaches I have used. Makes it difficult to get things started. How will you press the broach?

You need to be careful that the broach does not tip forward when pressing, as that will distort the keyway. (Don't ask me how I know. :) )

Tom
 

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??? ??? If ya look for one to DL try to find a older one . The newer ones are aiming more & more to the CNC guys & stuff for us manual folks is disappearing . There's several online in PDF form that can be DL'd for free

animal

On 2/29/24 8:21 AM, davesmith1800 wrote:

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.?

Attachments:
 

I would look for 1940's maybe 1950's?
I have both books?
After that they become more difficult to under stand. In 1960's that start with more on product and by 1980's was going in CNC and writing was like school teach wrote the book.
?The 1940's was like machinist wrote book. Easy to find information fast.

Dave?

mike allen
11:47am? ?
? ? ? ? If ya look for one to DL try to find a older one . The newer ones are aiming more & more to the CNC guys & stuff for us manual folks is disappearing . There's several online in PDF form that can be DL'd for free
animal
 

Hello,Paul!
It is not rocket science. I would keep the keyway clearance at .0005” to .001”.
The closer the fit the less chance of wear.

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