Thanks to George and Arthur I have some old bearing to start testing with. &johannes ? ? Sendt fr? for Windows ? ? Well, most bearing places will have a choice of bearings. Dont think it would be hard to add them onto what you have. On Friday, March 18, 2022, 06:09:29 PM PDT, Johannes <johannes@...> wrote: I dont like this steady rest, I am sure I am doing something wrong, it always destroy my metal rod. Has someone have success with this solution?
? &johnnes ?
|
Yes, worked fine for me once I learned how to set it up.
On Friday, March 18, 2022, 06:08:24 PM PDT, Johannes <johannes@...> wrote:
I dont like this steady rest, I am sure I am doing something wrong, it always destroy my metal rod. Has someone have success with this solution? ? &johnnes ?
|
Well, most bearing places will have a choice of bearings. Dont think it would be hard to add them onto what you have.
george
On Friday, March 18, 2022, 06:09:29 PM PDT, Johannes <johannes@...> wrote:
I dont like this steady rest, I am sure I am doing something wrong, it always destroy my metal rod. Has someone have success with this solution? ? &johnnes ?
|
I dont like this steady rest, I am sure I am doing something wrong, it always destroy my metal rod. Has someone have success with this solution? ? &johnnes ?
|
Re: Free Machining pdfs Available Online
Thanks, Mike. That's an excellent resource. Some of the 'Workshop Practice Series' books from the UK (Tubal Cain and other authors) are there too. John
_._,_._,_
I have been able to find a number of the Workshop Practice series as used books for quite reasonable prices at Alibris Books??and Thriftbooks ??
(Which are both actually collections of independent booksellers.) Thriftbooks shows several different ones in stock right now.
Being an old fart who likes physical books, this has saved me a bunch of money. (not as much as free pirate versions off of PDF com, though. )?
I was glad to be able to get copies of Guy Lautard¡¯s Machinist¡¯s Bedside Reader books (which I would buy in a heartbeat if he¡¯d only republish them :-( ?Even POD would work; my brother and sister in law have both self-published several books that way, apparently quite successfully...she¡¯s up to her third or fourth mystery novel I think )
--? Bruce Johnson
"Wherever you go, there you are." B. Banzai, PhD
|
Re: Mods, was Different Prices - such a range!
What is the 0.01 mm spec mean?? What is being measured?? ? The cheapest grade of bearing, ABEC-1 is better than 0.01 runout. (it is 0.0075.)? Typically machine tools will use ABEC-7 bearing with runout spec'd at 0.0025.
You should?not read much into "marketing specifications" if they don't state how the measurements were made.
That's? exactly the reason why I asked for any first hand experience of Vevor lathes...
Kaj
|
I've used the steady rest a few times to support larger diameter work when the tailstock center was in the way. I found that the stock brass pieces didn't retract far enough to suit work which would still fit through the opening in the frame, so I spent some time with files and enlarged the slots in those. The end of those brass pieces weren't square, so fixing that and rounding the ends a bit with fine sandpaper helped, too. Along with a liberal shot of oil when things were moving... :)  
|
Re: Extending cross slide travel -- what is the currently accepted best method?
On Tue, Feb 22, 2022 at 04:04 AM, drmico60 wrote:
The advantage of moving the nut to the end of the cross slide is that it enable a split delrin nut so if eventually some backlash occurs then it can be adjusted and the back lash eliminated. I have had the delrin nut in place for several years and I have never had to adjust out the backlash!!
I think it should be possible to attach a small shelf to the back of the standard OEM crosslide and then fit the split delrin nut to it.
I didn't move the brass/bronze (?) nut. I 'milled' the slide with my router and left the nut in the original spot. But a split nut sounds like an excellent idea for eliminating/reducing backlash.It seems to me that it doesn't matter how much space is between the two parts of a 'split' nut; the important thing is that the two nuts are 'out of sync' a small amount to tighten the fit of the threaded shaft. So adding a secondary nut at the back of the slide might be a possibility? I haven't thought through the details on this, so it may not be practical or any less work than moving the stock nut. Making a new LH nut may involve making a tap 'from scratch' if one isn't easily found for sale, so a bit of a challenge there.....
|
Re: Different Prices - such a range!
Living in Canada, even a mini-lathe was out of my budget range, since there are few low-priced options here. I was lucky to accidentally find a used 7x14 for sale nearby for $500CAD and I grabbed it. I'd already figured that I shouldn't spend more than 1/3 of my budget on the lathe, since the tooling and 'optional accessories' would add up to a lot more.
My MicroLux 7x14 'TruInch' hasn't been sold for years, so this is a bit off-topic, but I wanted to mention the motor mount. The motor on mine is on a pivoting 'hinge' mount, which seems much more solid than the two bolts in slots style I see in Youtube videos. It also has a 'real' half-nut setup with two half nuts. Things like that aren't usually listed in the specs, so probably one needs to 'trust' that the sellers of higher priced lathes like LMS and MicroMark have specified better features from the Sieg factory. It's a bit of a gamble.
Having said all that, I would find it fun to 'fix up' even a lower quality 'bargain' lathe, since I don't yet have any real ambition to make machine shop projects (clock, steam engine, etc..). So I can learn while doing 'mods' to the lathe and making knurled knobs for other tools around the shop. :)
|
Re: Extending cross slide travel -- what is the currently accepted best method?
I'll try again to post a pic of my slide mods:  Sharp-eyed readers may spot the green masking tape at the left. That's covering an opening where the motor controller box would normally be mounted - I still have the 'temporary' off-lathe controller wired to the lathe motor, even though I have the stock controller back from the repair service "Old UHF Guy". Also, I repainted the black 'drip tray' and 'backsplash' to white as it makes it easier to see the work in the chuck.
|
Re: Free Machining pdfs Available Online
Thanks, Mike.
That's an excellent resource. Some of the 'Workshop Practice Series' books from the UK (Tubal Cain and other authors) are there too.
John
|
Re: Extending cross slide travel -- what is the currently accepted best method?
On Sun, Feb 20, 2022 at 04:19 PM, Tony Jones wrote:
Googling I can find lots of approaches and I'm struggling with what is considered the best approach in 2022 (ideas tend to evolve).
Tony- I just joined this group, so you probably have decided what to do in the month since you posted that question. However, I thought I would add some thoughts as I just completed mods on the compound and cross slide on my 7x14. One method that didn't make your list is the very well thought out set of ideas from 'grepper' in this post: It's well worth a read. I used his method to change the compound (I made a new leadscrew and retainer 'block', saving the original parts). It worked so well that I modified the cross slide using the same ideas. I had already 'milled' the slide to extend the travel, so the work involved making a new leadscrew and an extended retainer block with bearings, a bushing for the dial to ride on, and a key for the handle. I'm really happy with the results.
|
Re: Mods, was Different Prices - such a range!
What is the 0.01 mm spec mean?? What is being measured?? ? The cheapest grade of bearing, ABEC-1 is better than 0.01 runout. (it is 0.0075.)? Typically machine tools will use ABEC-7 bearing with runout spec'd at 0.0025.
You should?not read much into "marketing specifications" if they don't state how the measurements were made.
On Thu, Mar 17, 2022 at 12:46 PM Kaj Wiik < kaj.wiik@...> wrote: Anyone have experience of Vevor 7x14 lathe, they state that " Spindle is supported by precision tapered roller bearings, spindle accuracy within 0.01 mm.", so no need of spindle bearing mod?
Cheers, Kaj
On Wed, Mar 16, 2022 at 07:45 PM, OldToolmaker wrote:
I like plastic change gears. They are more quiet and are the weak link in case of a crash.
If adjusted correctly will last forever. I have had the same set for over eleven years.
Never broke a plastic change gear.? ? My current 7x does not have headstock gears, but never had a problem on a previous 7x with 2-speed headstock.? ? There are many issues with these lathes - the plastic gears are not one of them.? ?JMO
?
--
Lone Tree, Colorado? ?USA
--
Chris Albertson
Redondo Beach, California
|
Re: Mods, was Different Prices - such a range!
I¡¯d want confirmation that it does in fact have tapered roller bearings installed. It¡¯s not that I don¡¯t believe them, it¡¯s that I don¡¯t believe everything just because it says so on the Internet. ? As far as myself the factory bearings are just fine for what I do with my lathe. But if I were to replace them I would go with ¡°angular contact bearings¡± instead of the tapered roller. There¡¯s no modification required, and they¡¯re less noisy. ? Michael - California, USA Micro-Mark MicroLux 7x16 LMS 3990 Hi-Torque Mill with power feed ? ? ?
toggle quoted message
Show quoted text
From: [email protected] < [email protected]> On Behalf Of Kaj Wiik Sent: Thursday, March 17, 2022 12:42 PM To: [email protected]Subject: Re: [7x12MiniLathe] Mods, was Different Prices - such a range! ? Anyone have experience of Vevor 7x14 lathe, they state that "Spindle is supported by precision tapered roller bearings, spindle accuracy within 0.01 mm.", so no need of spindle bearing mod? ? On Wed, Mar 16, 2022 at 07:45 PM, OldToolmaker wrote: I like plastic change gears. They are more quiet and are the weak link in case of a crash.
If adjusted correctly will last forever. I have had the same set for over eleven years.
Never broke a plastic change gear.? ? My current 7x does not have headstock gears, but never had a problem on a previous 7x with 2-speed headstock.? ? There are many issues with these lathes - the plastic gears are not one of them.? ?JMO
?
--
Lone Tree, Colorado? ?USA
|
Re: Mods, was Different Prices - such a range!
At that price ($550 US at todays exchange rate ) I am going to take a wild guess and say either a) they mistranslated the Chinese language description or b) they¡¯re lying.?
On Mar 17, 2022, at 12:42 PM, Kaj Wiik < kaj.wiik@...> wrote:
Anyone have experience of Vevor 7x14 lathe, they state that " Spindle is supported by precision tapered roller bearings, spindle accuracy within 0.01 mm.", so no need of spindle bearing mod?
Cheers, Kaj
On Wed, Mar 16, 2022 at 07:45 PM, OldToolmaker wrote:
I like plastic change gears. They are more quiet and are the weak link in case of a crash.
If adjusted correctly will last forever. I have had the same set for over eleven years.
Never broke a plastic change gear.? ? My current 7x does not have headstock gears, but never had a problem on a previous 7x with 2-speed headstock.? ? There are many issues with these lathes - the plastic gears are not one of them.? ?JMO
?
--
Lone Tree, Colorado? ?USA
--? Bruce Johnson
"Wherever you go, there you are." B. Banzai, PhD
|
Re: Mods, was Different Prices - such a range!
Anyone have experience of Vevor 7x14 lathe, they state that " Spindle is supported by precision tapered roller bearings, spindle accuracy within 0.01 mm.", so no need of spindle bearing mod?
Cheers, Kaj
On Wed, Mar 16, 2022 at 07:45 PM, OldToolmaker wrote:
I like plastic change gears. They are more quiet and are the weak link in case of a crash.
If adjusted correctly will last forever. I have had the same set for over eleven years.
Never broke a plastic change gear.? ? My current 7x does not have headstock gears, but never had a problem on a previous 7x with 2-speed headstock.? ? There are many issues with these lathes - the plastic gears are not one of them.? ?JMO
?
--
Lone Tree, Colorado? ?USA
|
Re: Mods, was Different Prices - such a range!
On Wed, Mar 16, 2022 at 07:45 PM, OldToolmaker wrote:
I like plastic change gears. They are more quiet and are the weak link in case of a crash.
If adjusted correctly will last forever. I have had the same set for over eleven years.
Never broke a plastic change gear.? ? My current 7x does not have headstock gears, but never had a problem on a previous 7x with 2-speed headstock.? ? There are many issues with these lathes - the plastic gears are not one of them.? ?JMO ? -- Lone Tree, Colorado? ?USA
|
Re: Mods, was Different Prices - such a range!
Ok, when I talked gears and one breaking it was because I had the lead screw engaged. As my lathe has a brushless motor,? I do not have gears internally for speed changes, etc. I misunderstood the op post.
george
On Wednesday, March 16, 2022, 06:27:03 PM PDT, Chris Albertson <albertson.chris@...> wrote:
Why bother changing out a gear that works?? ?If it breaks then think about what to replace it with.? ??
But you know what?? ?There is a Youtube video with this machinest?who uses the name "tubalcain".? He replaces a metal gear in his full size? lathe with a plastic 3D printed gear then tries to break the gear?by making cuts that are too large.? ? ?The 3D printed gear does not break.
There are also good engineering reasons?to use plastic in place of metal, The plastic might be designed to shear before the iron casting breaks.? So the designer might be using plastic?as a kind of mechanical fuse to prevent damage if the operator leaves the chuck key in the chuck.
The BEST solution is to not have?gears at all.? A good 3 phase spindle motor?would?run all the way down to zero RPM and lead screws are better when powered by a computer-controlled servo or stepper than change ears.
I think one of the things Elon Musk said about engineering is true "the best part is no part".? If the part is designed out then it need not be manufactured, it will never break and you don't have to pay for it.
On Tue, Mar 15, 2022 at 7:19 PM Stan Gammons via <buttercup11421= [email protected]> wrote:
Interesting discussion.? I have a 7x10 and it has been able to
anything I've wanted to do so far.? I'm still learning and getting
better :)
What does the group think of changing the plastic gears out for
metal gears?? Not worth it?
Stan
On 3/15/22 21:04, Michael Jablonski
wrote:
Sounds about right. The $729.95 that I said
mine cost included the $65 extra shipping charge they tacked
on. So the lathe was 664.95 without the extra shipping charge
on top of the regular shipping charges. By the time I was done
it was $1066.
?
Michael - California, USA
Micro-Mark MicroLux 7x16
LMS 3990 Hi-Torque Mill with power feed
?
?
?
?
I bought my MicroMark in 2011 on sale for
$679.00. I love the BLDC motor. No noisy gears, just a nice
quiet purring sound.
--
Chris Albertson
Redondo Beach, California
|
Re: Mods, was Different Prices - such a range!
I like plastic change gears. They are more quiet and are the weak link in case of a crash.
If adjusted correctly will last forever. I have had the same set for over eleven years.
|
Re: Mods, was Different Prices - such a range!
Why bother changing out a gear that works?? ?If it breaks then think about what to replace it with.? ??
But you know what?? ?There is a Youtube video with this machinest?who uses the name "tubalcain".? He replaces a metal gear in his full size? lathe with a plastic 3D printed gear then tries to break the gear?by making cuts that are too large.? ? ?The 3D printed gear does not break.
There are also good engineering reasons?to use plastic in place of metal, The plastic might be designed to shear before the iron casting breaks.? So the designer might be using plastic?as a kind of mechanical fuse to prevent damage if the operator leaves the chuck key in the chuck.
The BEST solution is to not have?gears at all.? A good 3 phase spindle motor?would?run all the way down to zero RPM and lead screws are better when powered by a computer-controlled servo or stepper than change ears.
I think one of the things Elon Musk said about engineering is true "the best part is no part".? If the part is designed out then it need not be manufactured, it will never break and you don't have to pay for it.
On Tue, Mar 15, 2022 at 7:19 PM Stan Gammons via <buttercup11421= [email protected]> wrote:
Interesting discussion.? I have a 7x10 and it has been able to
anything I've wanted to do so far.? I'm still learning and getting
better :)
What does the group think of changing the plastic gears out for
metal gears?? Not worth it?
Stan
On 3/15/22 21:04, Michael Jablonski
wrote:
Sounds about right. The $729.95 that I said
mine cost included the $65 extra shipping charge they tacked
on. So the lathe was 664.95 without the extra shipping charge
on top of the regular shipping charges. By the time I was done
it was $1066.
?
Michael - California, USA
Micro-Mark MicroLux 7x16
LMS 3990 Hi-Torque Mill with power feed
?
?
?
?
I bought my MicroMark in 2011 on sale for
$679.00. I love the BLDC motor. No noisy gears, just a nice
quiet purring sound.
--
Chris Albertson
Redondo Beach, California
|
Johannes
OldToolmaker