Re: Lathe and milling attachment - which cutters to get started?
Just to clarify- I am looking for suggestions for the best milling cutters to start with - sizes and types. Thanks.
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Re: Lathe and milling attachment - which cutters to get started?
On Mon, Apr 4, 2022 at 10:59 PM, <mfslater@...> wrote:
Get half a dozen 3/8" square HSS blanks
Thanks, Martin, but my question was about milling cutters...end mills, fly cutter, etc....I should have stated it more clearly.
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Re: Height of compound above ways?
If they're that different, it might be worth it to change them so they're not.? Put the taller compound on the faceplate and turn it down until they match.
Mike Taglieri?
On Sun, Apr 3, 2022, 8:22 PM j_r_abercrombie via <j_r_abercrombie= [email protected]> wrote: Compound slide height above ways: I thought I would be able to swap tools in their QCTP holders between my Microlux 7x14 and my Vevor 7x14. Surprise!  The height to the top of the compound slide is different on the two lathes; though the spindle center height above the ways is the same. On the Vevor the top of the compound is about 3.5 mm lower than on the MicroLux. (71mm vs 74.5mm) The reduction is in the compound slide top and base. So we're not dealing with exact 'clones' even though it looks like the basic castings are very similar on different machines. Do other brands/ variants have different heights? I haven't checked yet, but I think this means that the parting tool holders with the sloping 'ramp' might be usable on the Vevor, while the one that came in the 'set' with the tool post isn't usable on my Microlux. I had to order a 'straight' holder from LittleMachineShop.
The difference might also affect the size of tools that will still be able to be set at center height.
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Re: Lathe and milling attachment - which cutters to get started?
Get half a dozen 3/8" square HSS blanks and learn to grind LH & RH tools. Later on you can buy a set of indexable tools - same size shanks. Avoid toolsets with brazed on carbide tool tips - they are only good for cast iron.
Martin
--
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5 Apr 2022, 06:26 by j_r_abercrombie@...:
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7x14 lathe with 500 watt motor, no Hi-Lo gearbox.
I have a milling attachment and collet faceplate and collets.
What cutters should I get to start?
I don't have any specific projects in mind, yet.
Thanks.
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Lathe and milling attachment - which cutters to get started?
7x14 lathe with 500 watt motor, no Hi-Lo gearbox.
I have a milling attachment and collet faceplate and collets.
What cutters should I get to start?
I don't have any specific projects in mind, yet.
Thanks.
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Re: New 7x12 delivered and on the bench.
??? ??? That's a pretty handy tool , but your much better off
using a test dial indicator .
??? ??? animal
On 4/3/2022 9:47 PM, j_r_abercrombie
via groups.io wrote:
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On Sun, Apr 3, 2022 at 05:54 PM, Roy wrote:
There's a dial indictor attachment for that!
Thanks, Roy - I didn't know about those. Actually my mini (cheap)
DTI will reach almost as far into the spindle as the Starrett
attachment.
Could a coaxial centering indicator be used for checking an
internal Morse taper?
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Re: 7x12 Mini Lathe: It works
#diy
On Mon, Apr 4, 2022 at 06:37 PM, Michael Jablonski wrote:
I¡¯ve thrown this out there a few times, and I¡¯ll do it once more in an attempt to clear things up.
It's an uphill? battle, Michael. Keep on fightin! :) On Sat, Aug 17, 2019 at 03:23 PM, Michael Jablonski wrote:
I was taught that when you have both halves it's a split nut, and when you only have half the nut it's a half nut.
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Re: 7x12 Mini Lathe: It works
#diy
I¡¯ve thrown this out there a few times, and I¡¯ll do it once more in an attempt to clear things up. ? I was taught that when you have threaded portions of the nut on the top and bottom, it is called a ¡°Split Nut¡±. As in a nut that is split into two pieces. ? When you have only half of the threaded portion of a nut and a follower (the little hook), it is called a ¡°Half Nut¡±. As in half of a nut. ? So your lathe has a Split Nut. ? This nomenclature has been corrupted over the decades even calling a Split Nut a Full Nut. ? Michael - California, USA Micro-Mark MicroLux 7x16 LMS 3990 Hi-Torque Mill with power feed ? ? ?
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From: [email protected] < [email protected]> On Behalf Of gcvisalia@... Sent: Monday, April 4, 2022 1:28 PM To: [email protected]Subject: Re: [7x12MiniLathe] 7x12 Mini Lathe: It works #diy ? Ok. Mine has two nuts or half nuts. On one area is a screw or bolt that limits the closing distance. I really had to clean up that mechanism including deepening the hole for the ball so that the lever had a better feel when in position. Plus all the crud and such on everything.? Sand, castings not cleaned up,, on and on. So yea, one does get to know ones machine intimately.? By the way, my lathe was not usable when I first got it. Then I half assed put it together and thought all was good. Nope, terrible. So totally apart again. This time, each component was gone through. Only the motor was ok. And the bed. On some of the components that go on the bed I had to file flat or clean up. Still working on a few more things before I consider it kind of done. Fun fun. On Monday, April 4, 2022, 10:02:56 AM PDT, j_r_abercrombie via groups.io <j_r_abercrombie@...> wrote: On Sun, Apr 3, 2022 at 11:25 PM, gcvisalia@... wrote: Dont yours have an adjusting screw for how tight the half nuts tighten on the lead screw ? Mine does and it took just a slight bit of turn to prevent the half nuts from grabbing the lead screw. Or am I missing something ?
I think the half-nut arrangement can vary. I now understand that the Vevor I bought is a RealBull machine, and my Microlux is a Sieg. The half-nut arrangement isn't the same on both of them. And, I know that some lathes (newer Siegs ??) have only one half-nut and a hook shaped bracket for the other side.
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Re: New 7x12 delivered and on the bench.
Dunno for sure - I've never used one of those! I use a DTI + a Mitutoyo Zero It:
?<??>
Roy
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Re: Height of compound above ways?
On Mon, Apr 4, 2022 at 12:20 PM, mario mohl wrote:
So a simple 3.5 mm shim on the Vevor will leave you where you wanted to be?
I'm just going to dedicate a couple of tools in their holders for the Vevor/RealBull. Or put tools in the stock holders and shim them to the right height to use on the Vevor. I'd never get a shim machined accurately enough that I wouldn't have to adjust the tool height when I moved from one machine to the other. My plan is to use the Vevor mostly with the milling attachment, once I get the carriage and cross slide tightened up. I posted mostly as a FYI for other new owners since it wasn't clear to me at first what size tools I should be buying.
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Re: 7x12 Mini Lathe: It works
#diy
Yes ! I forgot that ! I put new hardware in because the flat of the bolts were not flat. Once I did that it was much better. Most? likely the next time if I take it apart again, all hardware will be replaced.
george
On Monday, April 4, 2022, 09:45:03 AM PDT, j_r_abercrombie via groups.io <j_r_abercrombie@...> wrote:
On Mon, Apr 4, 2022 at 09:39 AM, Mark Kimball wrote:
I had an alignment problem that turned out to be caused by crappy saddle bolts -- the underside of each head was rounded so they always just settled back down into their previous location in the slot, despite anything I did.?
OK! Another thing to check! :) Thanks.
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Re: 7x12 Mini Lathe: It works
#diy
Ok. Mine has two nuts or half nuts. On one area is a screw or bolt that limits the closing distance. I really had to clean up that mechanism including deepening the hole for the ball so that the lever had a better feel when in position. Plus all the crud and such on everything.? Sand, castings not cleaned up,, on and on. So yea, one does get to know ones machine intimately.? By the way, my lathe was not usable when I first got it. Then I half assed put it together and thought all was good. Nope, terrible. So totally apart again. This time, each component was gone through. Only the motor was ok. And the bed. On some of the components that go on the bed I had to file flat or clean up. Still working on a few more things before I consider it kind of done. Fun fun.
george
On Monday, April 4, 2022, 10:02:56 AM PDT, j_r_abercrombie via groups.io <j_r_abercrombie@...> wrote:
On Sun, Apr 3, 2022 at 11:25 PM, gcvisalia@... wrote:
Dont yours have an adjusting screw for how tight the half nuts tighten on the lead screw ? Mine does and it took just a slight bit of turn to prevent the half nuts from grabbing the lead screw. Or am I missing something ?
I think the half-nut arrangement can vary. I now understand that the Vevor I bought is a RealBull machine, and my Microlux is a Sieg. The half-nut arrangement isn't the same on both of them. And, I know that some lathes (newer Siegs ??) have only one half-nut and a hook shaped bracket for the other side.
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Re: Turning Brass and Aluminum on a 7x14
I had the same experience of having brass gibs warping after machining, so I did some research on the topic. You can find the discussion and references here :
https://sites.google.com/site/lagadoacademy/machining---lathes-mills-etc/brass---stress-relieving
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Re: Height of compound above ways?
So a simple 3.5 mm shim on the Vevor will leave you where you wanted to be?
On Sun, Apr 3, 2022 at 11:53 PM j_r_abercrombie via <j_r_abercrombie= [email protected]> wrote: On Sun, Apr 3, 2022 at 05:22 PM, <j_r_abercrombie@...> wrote:
The difference might also affect the size of tools that will still be able to be set at center height.
Using the stock tool post (which is the same dimensions for the 2 lathes - the MicroLux a Sieg, the Vevor a RealBull) here's a 12mm insert tool in the Vevor.
The brass height gauge is at spindle center height.
Here's the same 12mm tool in the MicroLux:
Microlux with 8 mm insert tool in stock toolpost:
Attachments:
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Re: 7x12 Mini Lathe: It works
#diy
Check the contact surfaces between the nut and the tailstock, the locking plate and the underside of the ways, and on the ways themselves.?
You get better hold if the contact surfaces on the ways is concentrated at the ends of the tailstock rather than all the way.
On Sun, Apr 3, 2022 at 11:36 AM, MZ Rider wrote:
For facing I brought the tail stock up to the saddle and locked it in place.
You are lucky your tailstock doesn't slip. It's an ongoing problem for my lathe.
--? Bruce Johnson
"Wherever you go, there you are." B. Banzai, PhD
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Re: 7x12 Mini Lathe: It works
#diy
On Sun, Apr 3, 2022 at 11:25 PM, gcvisalia@... wrote:
Dont yours have an adjusting screw for how tight the half nuts tighten on the lead screw ? Mine does and it took just a slight bit of turn to prevent the half nuts from grabbing the lead screw. Or am I missing something ?
I think the half-nut arrangement can vary. I now understand that the Vevor I bought is a RealBull machine, and my Microlux is a Sieg. The half-nut arrangement isn't the same on both of them. And, I know that some lathes (newer Siegs ??) have only one half-nut and a hook shaped bracket for the other side.
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Re: 7x12 Mini Lathe: It works
#diy
On Mon, Apr 4, 2022 at 01:27 AM, MZ Rider wrote:
I guessed where it went but had not realized it was reversing the lead screw. I might have made a LH thread on a lathe when I first learnt over 50 years ago but have never bothered since!
My only machine shop class was in the 1970s, so we have that in common! I use the technique described by Joe Pieczynski on YouTube for cutting RH threads - tool upside down, lathe turning in reverse, leadscrew turning the same direction. For LH threads (new cross slide leadscrew), tool rightside up, lathe turning forward, leadscrew in opposite direction (reverse). In both cases the tool is moving away from the chuck and any shoulder in the workpiece. It reduces my stress level a lot! :) Cutting away from the chuck is useful sometimes and I get a better finish (well, more consistent anyway) by using power carriage feed.
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Re: Turning Brass and Aluminum on a 7x14
" If you heat the brass with a propane torch until red then quench it in water, it will anneal (soften) it and it is real easy to form."
It CAN be useful to heat brass, copper and aluminum if they've been work hardened.? Due to the manufacturing process some of these materials may be work hardened right out of the chute, so annealing them does make some sense.? The quenching part isn't needed (or desired).
I know that brass can have some built-in stress because I made some brass gibs and they warped after I machined them.? Baking in a 500F oven helped a little bit, but since most brass contains lead it's not a good idea to do it in your kitchen oven.? I have a little toaster oven dedicated for stuff like that.
I haven't come across any aluminum that had a noticeable amount of stress but I pretty much just use 6061 or the hardware stuff.
Mark
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Re: 7x12 Mini Lathe: It works
#diy
On Mon, Apr 4, 2022 at 09:39 AM, Mark Kimball wrote:
I had an alignment problem that turned out to be caused by crappy saddle bolts -- the underside of each head was rounded so they always just settled back down into their previous location in the slot, despite anything I did.?
OK! Another thing to check! :) Thanks.
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Re: 7x12 Mini Lathe: It works
#diy
On Mon, Apr 4, 2022 at 07:28 AM, gcvisalia@... wrote:
I did this with the gear removed so that I could feel everything.
Good idea. I'm going to do that when I get back to 'fine tuning' the leadscrew and half nuts.
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