I still have my 20-year-old mini lathe and it is just fine the way it came. Regards, John Mattis (retired mechanical engineer)
On Fri, Oct 18, 2024 at 9:35?AM thomasfkeefe via <thomasfkeefe= [email protected]> wrote: Roy, I am still considering my options and may decide it's not worth switching.
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Tom
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Pierre, I believe both versions of the lathe use module 1 gears. And I think they are sold with same set of nylon gears. But I could be wrong about that.?
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I have done some single point threading on the lathe. As the difference in pitch between 16tpi and 1.5 mm is pretty small, I never really noticed. Many times I threaded things I didn't have a tap or die for. So I would end up doing both sides. But I am kind of embarrassed to discover it after such a long time.
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Tom
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With my metric lathe I got the imperial 16 TPI leadscrew and half nuts, I don’t recall getting a spare apron so I don’t think that’s a problem. ? I’ve only had to cut a few imperial threads, nothing exotic just ?” or ?” or whatever, and used the LMS calculator: to set up the gears.? Came out close enough for my needs. ? IIRC cutting metric on an imperial lathe is harder. ? Of course with computer control the problem just goes away no matter what you have. ? Tony ? ?
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From: [email protected] <[email protected]> On Behalf Of Ryan H via groups.io
Sent: Saturday, 19 October 2024 4:07 AM
To: [email protected]
Subject: Re: [7x12MiniLathe] CJ0618 lead screw? Wasn't thinking about that but st a minimum I'm pretty sure you're going to have to swap the half nut actuator shaft and maybe the apron. The nuts use a different engagement to the shaft and I don't know if the shaft will fit the Seig apron.?
I went with a electric lead screw a couple years ago. Back then it cost me a bit over 500 dollars for everything but has been great. I push buttons and can change from imperial threading to metric in seconds and also do feed in both.?
For me it was worth every penny as I do quite a bit of both imperial and metric single point threading.? On Oct 18, 2024 at 12:44?PM -0400, thomasfkeefe@... <thomasfkeefe@...>, wrote:
Tony Smith, I suspect you are right about shipping. But I will keep that in mind. Thanks.
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Wasn't thinking about that but st a minimum I'm pretty sure you're going to have to swap the half nut actuator shaft and maybe the apron. The nuts use a different engagement to the shaft and I don't know if the shaft will fit the Seig apron.?
I went with a electric lead screw a couple years ago. Back then it cost me a bit over 500 dollars for everything but has been great. I push buttons and can change from imperial threading to metric in seconds and also do feed in both.?
For me it was worth every penny as I do quite a bit of both imperial and metric single point threading.?
On Oct 18, 2024 at 12:44?PM -0400, thomasfkeefe@... <thomasfkeefe@...>, wrote:
Tony Smith, I suspect you are right about shipping. But I will keep that in mind. Thanks.
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Tom
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Tony Smith, I suspect you are right about shipping. But I will keep that in mind. Thanks.
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Tom
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Roy, I am still considering my options and may decide it's not worth switching.
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Tom
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Grizzly has them for their 7x14 which is like the Real Bull. The part number is P0765129 and lists for $53.50. You would also need to change the half nuts. The part number is P0765075 and lists for $33.90 for the pair. I would check with them to make sure they fit your brand of lathe. Paul M
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Hi Thomas,
If you want to replace a metric lead screw by an imperial one,
the pinion sets, as per the threading table of your lathe, will
need to be modified. This is mandatory because there are no common
divider in between millimeters and inches. So,
- either you recompute each pinion set for each pitch with the
existing pinions, making the compromise to have some close
approximations,
- or you'll have to buy pinions compatible with the imperial pitches
you intend to make. In your case, the existing pinions are more
likely metric in diameter and module. Imperial pinions are
imperial?(!), their teeth are measured in inches, and the metric
'module' is expressed in terms of 'diametral pitch' that is a
different unit. The module is equal to the primitive diameter in mm
divided by the number of teeth hence a module of 1 corresponds to a
tooth-to-tooth distance of 3.14mm measured on the primitive
diameter. The diametral pitch is equal to the number of teeth
divided by the primitive diameter in inches. Both Module and
Diametral Pitch have no unit.
Equivalence table (the circular pitch corresponds to the distance
between 2 teeth, measured on the primitive diameter, here in mm. No
practical use, just an indication) :
Of course, metric gears are not compatible with imperial pinions,
even with the same tooth number or same diameter.
In addition, make sure? before ordering that you have room to mount
the pinions on the existing bracket.
Just a remark: It seems that you didn't make threading for 5
years, otherwise you had already discovered the issue, do you
absolutely need to make the transition to imperial ? The character
of this transition does only apply to threading, unless you have
specific accessories TBD on your lathe. In consequence, if you
don't thread on the lathe and if the lead screw and/or half nuts
aren't damaged, keep the current configuration !
Regards
On 17.10.24 23:36, thomasfkeefe via
groups.io wrote:
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When I purchased my mini lathe (about 5yrs ago) it was
advertised as having a 16tpi lead screw. I recently decided to
check and noticed that is not the case. It is actually the 1.5mm
pitch leadscrew instead.?
?
I am considering purchasing a 16tpi replacement along with
new half nuts. I found the items on Arc Eurotrade. However, the
shipping to the US is a bit expensive. I haven't been able to
find these items on Amazon. eBay and AliExpress have the metric
version but I cannot find imperial versions. Little Machine Shop
has lead screws for Sieg 7x14 lathes, but I believe there are
some differences that may cause problems.
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My Real Bull came fitted with a metric leadscrew, and for some reason had the imperial one as well. ? I’ve never had to use the imperial one, but shipping (I’m in Oz) would be a bit steep. ? Tony ? ?
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From: [email protected] <[email protected]> On Behalf Of Ryan H via groups.io
Sent: Friday, 18 October 2024 11:34 AM
To: [email protected]
Subject: Re: [7x12MiniLathe] CJ0618 lead screw? The CJ0618 is a Real bull lathe. If I remember right (don't quote me 100%) the Grizzly 7X mini is also. Take a look there. It's easy enough to tell a Sieg from a RB by the cross slide. The RB has the solid rectangular slide and the Seig has the "H" shaped one. Shipping from Arc is a bit expensive across the pond but in my experience they are very good to deal with so there's that.? On Oct 17, 2024 at 5:36?PM -0400, thomasfkeefe@... <thomasfkeefe@...>, wrote:
When I purchased my mini lathe (about 5yrs ago) it was advertised as having a 16tpi lead screw. I recently decided to check and noticed that is not the case. It is actually the 1.5mm pitch leadscrew instead.? I am considering purchasing a 16tpi replacement along with new half nuts. I found the items on Arc Eurotrade. However, the shipping to the US is a bit expensive. I haven't been able to find these items on Amazon. eBay and AliExpress have the metric version but I cannot find imperial versions. Little Machine Shop has lead screws for Sieg 7x14 lathes, but I believe there are some differences that may cause problems. Has anyone else made this swap or have suggestions as to where I should look for these items.
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Why are you considering replacing the lead screw?
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There are numerous sites that provide comprehensive threading charts for either flavor lead screw; with 3-D printing, additional change gears are easily obtainable.? Actually, if you had access to an engine lathe, you could even make your own leadscrew ;-)
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Roy
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The CJ0618 is a Real bull lathe. If I remember right (don't quote me 100%) the Grizzly 7X mini is also. Take a look there. It's easy enough to tell a Sieg from a RB by the cross slide. The RB has the solid rectangular slide and the Seig has the "H" shaped one. Shipping from Arc is a bit expensive across the pond but in my experience they are very good to deal with so there's that.?
On Oct 17, 2024 at 5:36?PM -0400, thomasfkeefe@... <thomasfkeefe@...>, wrote:
When I purchased my mini lathe (about 5yrs ago) it was advertised as having a 16tpi lead screw. I recently decided to check and noticed that is not the case. It is actually the 1.5mm pitch leadscrew instead.?
?
I am considering purchasing a 16tpi replacement along with new half nuts. I found the items on Arc Eurotrade. However, the shipping to the US is a bit expensive. I haven't been able to find these items on Amazon. eBay and AliExpress have the metric version but I cannot find imperial versions. Little Machine Shop has lead screws for Sieg 7x14 lathes, but I believe there are some differences that may cause problems.
?
Has anyone else made this swap or have suggestions as to where I should look for these items.
?
Thanks in advance.?
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When I purchased my mini lathe (about 5yrs ago) it was advertised as having a 16tpi lead screw. I recently decided to check and noticed that is not the case. It is actually the 1.5mm pitch leadscrew instead.?
?
I am considering purchasing a 16tpi replacement along with new half nuts. I found the items on Arc Eurotrade. However, the shipping to the US is a bit expensive. I haven't been able to find these items on Amazon. eBay and AliExpress have the metric version but I cannot find imperial versions. Little Machine Shop has lead screws for Sieg 7x14 lathes, but I believe there are some differences that may cause problems.
?
Has anyone else made this swap or have suggestions as to where I should look for these items.
?
Thanks in advance.?
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Roy Yes, it should be possible , on the paper. However, I have used my 7x16 in many years to make a Sterling machine, no one will start.
This Jupiter pencil sharpener was very popular for many, many years. A Beauty , and expensive tool. The cutting blade is still available on eBay. However, it is expensive. I managed to sharpen it, but it is not made for that. Johannes ? Lavoll. ? ? ? ? ? ? ?
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On 10 Oct 2024, at 17:45, Roy via groups.io <roylowenthal@...> wrote:
? Nice!
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I guess the next project will be a wood-fired steam engine to eliminate the hand cranking while disposing of the pencil shavings ;-)
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Roy
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Nice!
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I guess the next project will be a wood-fired steam engine to eliminate the hand cranking while disposing of the pencil shavings ;-)
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Roy
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Very nice!? Thanks for sharing.
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Jeff
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pretty cool , a couple of steppers & ya may have the first
CNC pencil sharpener
thanks for sharing
animal
On 10/9/24 7:19 PM, Johannes wrote:
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Hi boys
Some time ago I asked you some technical questions about an old
German Pencil Sharpener. Made by?Guhl & Harbeck , Hamburg,
and I got a lot of help.
Thanks again.
I have made a short?video, check?it out on:
Johannes
Mexico
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Hi boys
Some time ago I asked you some technical questions about an old German Pencil Sharpener. Made by?Guhl & Harbeck , Hamburg, and I got a lot of help.
Thanks again.
I have made a short?video, check?it out on:
Johannes
Mexico
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Re: Angled Backsplash Idea
The lathe purchase last November had bothb.
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I would make so you remove easily.? Some you want remove. The hard takes wrench set?
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Dave?
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On Mon, Sep 30, 2024 at 01:14 PM, Charles Kinzer wrote:
A few times I have mentioned how the back splash on mini lathes doesn't really scale down well from larger lathes and makes things too crowded when trying to work around or clean the back side area of the lathe.
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"Mr. Pete" (Tubalcain) has been running a series on the early Unimats, and out of the blue somebody sent him a little cabinet with a backsplash that was ANGLED.
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This seems to help greatly in opening up the space behind the lathe.? The notches are designed to hold tool holders, but you could make notches, or holes, for anything to get additional utility.? Or none at all.? You could make a top bend rearward and horizontal and put holes in it to hold centers and such.? The part here is stainless and must be pretty thick as he said it weight 10 lbs.
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Here is the entire YouTube video where he shows this.
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This is one of those things where my reaction is, "Why didn't I think of that?"
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Charles E. "Chuck" Kinzer
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Re: Angled Backsplash Idea
I have use on some lathes cookies sheets for both backslash and under lathe.
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Dave?
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On Mon, Sep 30, 2024 at 01:14 PM, Charles Kinzer wrote:
A few times I have mentioned how the back splash on mini lathes doesn't really scale down well from larger lathes and makes things too crowded when trying to work around or clean the back side area of the lathe.
?
"Mr. Pete" (Tubalcain) has been running a series on the early Unimats, and out of the blue somebody sent him a little cabinet with a backsplash that was ANGLED.
?
This seems to help greatly in opening up the space behind the lathe.? The notches are designed to hold tool holders, but you could make notches, or holes, for anything to get additional utility.? Or none at all.? You could make a top bend rearward and horizontal and put holes in it to hold centers and such.? The part here is stainless and must be pretty thick as he said it weight 10 lbs.
?
?
Here is the entire YouTube video where he shows this.
?
?
This is one of those things where my reaction is, "Why didn't I think of that?"
?
Charles E. "Chuck" Kinzer
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Re: Angled Backsplash Idea
Same here.? I got rid of the backsplash years ago.
Mike Taglieri?
A few times I have mentioned how the back splash on mini lathes doesn't really scale down well from larger lathes and makes things too crowded when trying to work around or clean the back side area of the lathe.
"Mr. Pete" (Tubalcain) has been running a series on the early Unimats, and out of the blue somebody sent him a little cabinet with a backsplash that was ANGLED.
This seems to help greatly in opening up the space behind the lathe.? The notches are designed to hold tool holders, but you could make notches, or holes, for anything to get additional utility.? Or none at all.? You could make a top bend rearward and horizontal
and put holes in it to hold centers and such.? The part here is stainless and must be pretty thick as he said it weight 10 lbs.
Here is the entire YouTube video where he shows this.
This is one of those things where my reaction is, "Why didn't I think of that?"
Charles E. "Chuck" Kinzer
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