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Re: end mill holder

 

There is an old military maxim: If it's stupid, but it works, it ain't stupid!

Sure, you don't want to get your knuckles too close to it in use, but it works, right? That's all you need. And a regular 3-jaw chuck is also something you don't want to get your knuckles too close to! When you're not a beginner anymore, maybe you'll want to make one that you think is better, and it might well be better, but this one works! ;) Best is the enemy of good enough!

You could also try putting a shorter set/grub screw in it. ;) Might help, might not. ;)

Bill in OKC

William R. Meyers, MSgt, USAF(Ret.)

Aphorisms to live by:
Good judgement comes from experience. Experience comes from bad judgement.?
SEMPER GUMBY!
Improvise, Adapt, and Overcome.
Physics doesn't care about your schedule.
The only reason I know anything is because I've done it wrong enough times to START to know better.
Expect in one hand, expectorate in the other. See which one gets full first.



On Tuesday, September 5, 2023 at 10:23:15 AM CDT, Mehmood via groups.io <mehmood.naqshbandi@...> wrote:


I’m a certified beginner. ?This was one of the first successful things I made.

image0.jpegimage1.jpeg

Yes I know the set screw arrangement is ‘unusual’, but I made it by tapping some silver steel / drill rod.


On 5 Sep 2023, at 16:01, Jeffrey Kropp <jeffreykropp1@...> wrote:

?
? ? Mert offered partially-machined end mill holders.

On Tue, Sep 5, 2023 at 9:41?AM Carl <carl.blum@...> wrote:

Hi Gang:

It is easy to drill and tap a drill chuck to fit Unimats, I've done it to chucks up to 1/2" capacity. I mostly use the 1/4" chuck converted in 1973.

While you can hold a milling cutter in a drill chuck, you will not come close to cutting capacity of the cutter. Most likely the cutter will move or even be ejected by cutting forces.

Much better is to make solid cutter holders from 3/4" bar stock. Drill and tap to match the spindle then bore for your cutter and add a set screw to clamp the cutter. I have 3/8" and 1/2" holders that work fine.

Carl.

On 9/5/2023 7:43 AM, Peter Brooks wrote:

Or of course a drill chuck. Depends what you are trying to do and how accurate you need to be.

Drill chucks to fit M14 x 1 (Unimat 3 / 4) or M12 x 1 (earlier Unimats) are probably easier to find than collet chucks with those threadings.
Re: end mill holder

 

开云体育

jjg tools on ebay.co.uk offers an er16 collet holder in 12x1 and 14x1?

Best Regards
John



On Sep 5, 2023, at 5:01 PM, Jeffrey Kropp <jeffreykropp1@...> wrote:

?
? ? Mert offered partially-machined end mill holders.

On Tue, Sep 5, 2023 at 9:41?AM Carl <carl.blum@...> wrote:

Hi Gang:

It is easy to drill and tap a drill chuck to fit Unimats, I've done it to chucks up to 1/2" capacity. I mostly use the 1/4" chuck converted in 1973.

While you can hold a milling cutter in a drill chuck, you will not come close to cutting capacity of the cutter. Most likely the cutter will move or even be ejected by cutting forces.

Much better is to make solid cutter holders from 3/4" bar stock. Drill and tap to match the spindle then bore for your cutter and add a set screw to clamp the cutter. I have 3/8" and 1/2" holders that work fine.

Carl.

On 9/5/2023 7:43 AM, Peter Brooks wrote:

Or of course a drill chuck. Depends what you are trying to do and how accurate you need to be.

Drill chucks to fit M14 x 1 (Unimat 3 / 4) or M12 x 1 (earlier Unimats) are probably easier to find than collet chucks with those threadings.
Re: end mill holder

Andrei
 

开云体育

You could buy one of these for 10=15 dollars and then tap the end for 14x1mm and you are done:?
Find many great new & used options and get the best deals for ER16 Collet Block Chuck Collet Holder Spindle Motor Shaft Clamping Tool Bar at the best online prices at eBay! Free shipping for many products!
www.ebay.com

Re: end mill holder

 

开云体育

“Die-ing”, not “tapping”. Wrong gender, so easy to confuse nowadays.


On 5 Sep 2023, at 16:23, Mehmood via groups.io <mehmood.naqshbandi@...> wrote:

?I’m a certified beginner. ?This was one of the first successful things I made.

<image0.jpeg>
<image1.jpeg>


Yes I know the set screw arrangement is ‘unusual’, but I made it by tapping some silver steel / drill rod.


On 5 Sep 2023, at 16:01, Jeffrey Kropp <jeffreykropp1@...> wrote:

?
? ? Mert offered partially-machined end mill holders.

On Tue, Sep 5, 2023 at 9:41?AM Carl <carl.blum@...> wrote:

Hi Gang:

It is easy to drill and tap a drill chuck to fit Unimats, I've done it to chucks up to 1/2" capacity. I mostly use the 1/4" chuck converted in 1973.

While you can hold a milling cutter in a drill chuck, you will not come close to cutting capacity of the cutter. Most likely the cutter will move or even be ejected by cutting forces.

Much better is to make solid cutter holders from 3/4" bar stock. Drill and tap to match the spindle then bore for your cutter and add a set screw to clamp the cutter. I have 3/8" and 1/2" holders that work fine.

Carl.

On 9/5/2023 7:43 AM, Peter Brooks wrote:

Or of course a drill chuck. Depends what you are trying to do and how accurate you need to be.

Drill chucks to fit M14 x 1 (Unimat 3 / 4) or M12 x 1 (earlier Unimats) are probably easier to find than collet chucks with those threadings.
Re: end mill holder

 

开云体育

I’m a certified beginner. ?This was one of the first successful things I made.

image0.jpegimage1.jpeg

Yes I know the set screw arrangement is ‘unusual’, but I made it by tapping some silver steel / drill rod.


On 5 Sep 2023, at 16:01, Jeffrey Kropp <jeffreykropp1@...> wrote:

?
? ? Mert offered partially-machined end mill holders.

On Tue, Sep 5, 2023 at 9:41?AM Carl <carl.blum@...> wrote:

Hi Gang:

It is easy to drill and tap a drill chuck to fit Unimats, I've done it to chucks up to 1/2" capacity. I mostly use the 1/4" chuck converted in 1973.

While you can hold a milling cutter in a drill chuck, you will not come close to cutting capacity of the cutter. Most likely the cutter will move or even be ejected by cutting forces.

Much better is to make solid cutter holders from 3/4" bar stock. Drill and tap to match the spindle then bore for your cutter and add a set screw to clamp the cutter. I have 3/8" and 1/2" holders that work fine.

Carl.

On 9/5/2023 7:43 AM, Peter Brooks wrote:

Or of course a drill chuck. Depends what you are trying to do and how accurate you need to be.

Drill chucks to fit M14 x 1 (Unimat 3 / 4) or M12 x 1 (earlier Unimats) are probably easier to find than collet chucks with those threadings.
Re: end mill holder

 

theres one on ebay with collets -?


------ Original Message ------
From "Jeffrey Kropp" <jeffreykropp1@...>
Date 05/09/2023 16:00:41
Subject Re: [Unimat] end mill holder

? ? Mert offered partially-machined end mill holders.

On Tue, Sep 5, 2023 at 9:41?AM Carl <carl.blum@...> wrote:

Hi Gang:

It is easy to drill and tap a drill chuck to fit Unimats, I've done it to chucks up to 1/2" capacity. I mostly use the 1/4" chuck converted in 1973.

While you can hold a milling cutter in a drill chuck, you will not come close to cutting capacity of the cutter. Most likely the cutter will move or even be ejected by cutting forces.

Much better is to make solid cutter holders from 3/4" bar stock. Drill and tap to match the spindle then bore for your cutter and add a set screw to clamp the cutter. I have 3/8" and 1/2" holders that work fine.

Carl.

On 9/5/2023 7:43 AM, Peter Brooks wrote:

Or of course a drill chuck. Depends what you are trying to do and how accurate you need to be.

Drill chucks to fit M14 x 1 (Unimat 3 / 4) or M12 x 1 (earlier Unimats) are probably easier to find than collet chucks with those threadings.

Re: end mill holder

 

? ? Mert offered partially-machined end mill holders.


On Tue, Sep 5, 2023 at 9:41?AM Carl <carl.blum@...> wrote:

Hi Gang:

It is easy to drill and tap a drill chuck to fit Unimats, I've done it to chucks up to 1/2" capacity. I mostly use the 1/4" chuck converted in 1973.

While you can hold a milling cutter in a drill chuck, you will not come close to cutting capacity of the cutter. Most likely the cutter will move or even be ejected by cutting forces.

Much better is to make solid cutter holders from 3/4" bar stock. Drill and tap to match the spindle then bore for your cutter and add a set screw to clamp the cutter. I have 3/8" and 1/2" holders that work fine.

Carl.

On 9/5/2023 7:43 AM, Peter Brooks wrote:

Or of course a drill chuck. Depends what you are trying to do and how accurate you need to be.

Drill chucks to fit M14 x 1 (Unimat 3 / 4) or M12 x 1 (earlier Unimats) are probably easier to find than collet chucks with those threadings.
Re: end mill holder

 

Can you get away with using a drill chuck to hold an end mill? Probably. Maybe. Sometimes. :) On a Unimat the forces are likely to be lower than on larger machines. BUT! The end mills you're using on a Unimat are likely to be small & fragile, so more likely to be damaged. Pull-out is probably the most likely problem. The forces applied pull the cutter into the material being cut, which can overload the cutter, pull the material out of the clamps, and shatter the end mill.?

Drill chucks make lousy end mill holders. They aren't really even all that good at holding drill bits. They grip along a narrow band in 3 locations 120 degrees apart with a curved surface that is very likely to slip. How many times have you seen a drill bit that has spun in the chuck? The shank gets torn up and can no longer get anything like concentricity.?

The fingers used in drill chucks to grip the drill bit shank are hardened, and frequently slip on a drill bit with a relatively short shank. They're used because they easily adjust to any size shank within their range, not because they grip reliably. Can you imagine buying a set of collets made to hold drill bits in .001" increments? Or less? Yikes! You'd need a set of nearly 1000 collets...?

End mills have hardened shanks and a drill chuck cannot reliably grip them. Weldon shank end mills were invented because straight shank end mills can still slip even in? properly sized end mill holders? or collets due to the forces involved. And even Weldon shank end mills in proper holders can be broken.?

There are tables that show the appropriate sizes for Weldon shank end mills & end mill holders, and they're not all that difficult to make. End mills come with a limited number of standardized shanks, so you only need a few end mill holders. Weldon shanks aren't perfect. They pushed the cutter off-center, and off balance. And there are probably dozens of other systems for holding end mills, but not all of them scale well for a Unimat.?

I have personally pulled a Weldon shank 1/2" end mill out of the holder and destroyed it and my part, on a Bridgeport-class milling machine. Was not quite spectacular, but was startling! :) Unimats aren't nearly as powerful, and you're unlikely to be using a half-inch end mill on one, but an eighth-inch end mill isn't nearly as strong and the parts you're making are probably much easier to destroy.?

And making tooling like end mill holders is good practice for more complex projects.

OK. Off my soap box now! ;)

Bill in OKC?

William R. Meyers, MSgt, USAF(Ret.)

Aphorisms to live by:
Good judgement comes from experience. Experience comes from bad judgement.?
SEMPER GUMBY!
Improvise, Adapt, and Overcome.
Physics doesn't care about your schedule.
The only reason I know anything is because I've done it wrong enough times to START to know better.
Expect in one hand, expectorate in the other. See which one gets full first.



On Tuesday, September 5, 2023 at 06:43:06 AM CDT, Peter Brooks <peter@...> wrote:


Or of course a drill chuck. Depends what you are trying to do and how accurate you need to be.

Drill chucks to fit M14 x 1 (Unimat 3 / 4) or M12 x 1 (earlier Unimats) are probably easier to find than collet chucks with those threadings.
Re: end mill holder

 

开云体育

Hi Gang:

It is easy to drill and tap a drill chuck to fit Unimats, I've done it to chucks up to 1/2" capacity. I mostly use the 1/4" chuck converted in 1973.

While you can hold a milling cutter in a drill chuck, you will not come close to cutting capacity of the cutter. Most likely the cutter will move or even be ejected by cutting forces.

Much better is to make solid cutter holders from 3/4" bar stock. Drill and tap to match the spindle then bore for your cutter and add a set screw to clamp the cutter. I have 3/8" and 1/2" holders that work fine.

Carl.

On 9/5/2023 7:43 AM, Peter Brooks wrote:

Or of course a drill chuck. Depends what you are trying to do and how accurate you need to be.

Drill chucks to fit M14 x 1 (Unimat 3 / 4) or M12 x 1 (earlier Unimats) are probably easier to find than collet chucks with those threadings.
Re: end mill holder

 

Or of course a drill chuck. Depends what you are trying to do and how accurate you need to be.

Drill chucks to fit M14 x 1 (Unimat 3 / 4) or M12 x 1 (earlier Unimats) are probably easier to find than collet chucks with those threadings.
Re: end mill holder

 

I just use my collet chuck on my unimat 3, it either screws onto the headstock end or tailstock end. just use the appropriate collet for the end mill.


------ Original Message ------
Date 04/09/2023 17:41:31
Subject [Unimat] end mill holder

I am new to Unimat.? Is there a source for an end mill holder for Unimat 3?

Re: Feed Transmission For Mini Lathe ?

 

开云体育

Hi Gang:

I built a power feed for my Unimat with the motor from my Erector set. I arranged the gears to have two speeds forward and back. To connect it I used a 10mm hex socket to connect to the handknob nut with the Erector set flex shaft. Worked great, but more nuance to me than just turning the cranks.

If I did it again I would use an Arduino with a stepping motor to get full speed control. I think you could build one for less than $50.

Carl.

On 9/4/2023 9:58 AM, Keith S. Angus wrote:

The alternative approach is to drive the lead screw with something like an electric screwdriver. No rubber bands or gears needed, and I reckon most people have one or two of them sitting about doing nothing most of the time. I binned a few last time I has a clear up in the garage.

Re: end mill holder

 

Hello Bud!
You could easily make your own and probably machine one up on your own U3. Not difficult to do.
Dick




On Monday, September 4, 2023, 12:48 PM, zinneckerbud@... wrote:

I am new to Unimat.? Is there a source for an end mill holder for Unimat 3?

Bud Z.

--
http://www.homemadetools.net/forum/?OFF-SET-tailstock-center-65965#post105972
?SMALL TURRET TOOL POST PLANS?
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end mill holder

 

I am new to Unimat.? Is there a source for an end mill holder for Unimat 3?

Bud Z.
end mill holder

 

I am new to Unimat.? Is there a source for an end mill holder for Unimat 3?
Re: How many Unimats is too many?

Andrei
 

开云体育

call 1-800-lathe

The number to help you find the Lathe Anonymous group near you.

From: [email protected] <[email protected]> on behalf of Unimat Matt <matthewtay2020@...>
Sent: Monday, September 4, 2023 4:15 AM
To: Kevin Groenke@ <PersonMakeObject groen004@...>; [email protected] <[email protected]>
Subject: Re: [Unimat] How many Unimats is too many?
?
I currently have 9 lathes. Though not all Unimats. ??

Re: How many Unimats is too many?

 

I have five lathes, only two are Unimats. Also four milling machine. Though two of those are Unimats. And three of my machines can be a lathe, mill, or drill press, though only two of them are Unimats. Had 6 drill presses, until yesterday. Gave the 8" Central Machinery to my neighbor. And again, only two are Unimats. :) Versatile machines!? :)

Bill in OKC

William R. Meyers, MSgt, USAF(Ret.)

Aphorisms to live by:
Good judgement comes from experience. Experience comes from bad judgement.?
SEMPER GUMBY!
Improvise, Adapt, and Overcome.
Physics doesn't care about your schedule.
The only reason I know anything is because I've done it wrong enough times to START to know better.
Expect in one hand, expectorate in the other. See which one gets full first.



On Monday, September 4, 2023 at 03:15:32 AM CDT, Unimat Matt <matthewtay2020@...> wrote:


I currently have 9 lathes. Though not all Unimats. ??

Re: How many Unimats is too many?

 

Hi Ken,

Congratulations on your new Unimat !

My favorite comment regarding how many you need is "one more than you have ..."? ;-)

I've posted a few times on this site about the CNC retrofit I installed on my Son's SL. I bought a kit from Scott at ZYLtech Engineering in Texas. It's been a while but I believe the kit and miscellaneous parts and materials were less than $100.00 at the?time.

His second SL is set up like a wood lathe?

Jay

On Sun, Sep 3, 2023, 8:12 PM Kevin Groenke @ PersonMakeObject via <groen004=[email protected]> wrote:

I got lucky on an underpriced sl today. Pretty well equipped and optioned. This will be my third for occasional light production and hobby work. Maybe time to consider a cnc retrofit??

Kevin Groenke
human of planet earth
Re: Feed Transmission For Mini Lathe ?

 

Hi Clankennedy,

I did it a different way I did not want to get into belts, pulley's, gears I used two double ended stepper motors so direct fixing and found two single action controllers, and it works very well on long work takes all of the hand winding away.
I replaced the way bars with longer to fit the motors to.
I fitted thrust washers to the leads screws to help reduce any drag, and you can set up repetitive cuts just great.
I also made two knobs to fit on motor shaft so with power off I can use the lathe by hand for small close work
And I made up the box with its own 24v dc power supply and wires for the controllers, just need to plug it into the mains and switch on.

I have also picked up a spare cast bed and fitted longer way bars to use just for turning wood or plastic.??

?

I retained all the original parts and could go back to a normal lathe again.
Re: Feed Transmission For Mini Lathe ?

 

The alternative approach is to drive the lead screw with something like an electric screwdriver. No rubber bands or gears needed, and I reckon most people have one or two of them sitting about doing nothing most of the time. I binned a few last time I has a clear up in the garage.
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