Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- 7x12MiniLathe
- Messages
Search
|
LMS 4700 mill
开云体育? This is the fine-adjuster to LMS 4700 Mill. Have somebody made a lock for this? ? My adjuster is moving (turning) when I am milling, and before I am doing something stupid, I want an advice from you. ? Best regards Johannes ? |
|
Re: diamond bits
Chris Albertson
These are abrasive blades. ? Abrasive work for the cut-off job because only a tiny part of the blade is in contact with the metal. ? Abrasives don't work as well for drilling holes in metal On Fri, Jul 21, 2017 at 6:58 PM, stan2778@... [7x12minilathe] <7x12minilathe@...> wrote:
--
Chris Albertson Redondo Beach, California |
|
Constant surface speed cutting CSS
Thought this may be of interest.A mod I did 2-3 years ago. Sorry, for the quality of the video as I am not?a professional movie maker. As I regularly cut largish?diameter bar up to 120 mm dia, held in a standard 4" (100mm ) Chuck using special soft jaws, I decided it would be practical?and doable to increase the cutting?RPM?s as I moved to the center.thus constantly changing the cutting surface speed keeping to optimums. This avoids taking one hand off the cross slide handle to alter the speed on the lathe control box pot and therefore not creating ?"dwell" marks on the surface as you are cutting. I like to use hands crossing over one another when feeding, that's the reason I made larger hand wheels than those silly "spoke" ?type that came with the machine. The CSS principle is similar?to CNC lathes using the G96 and cancels with G97 codes. Very basically, the wiring configuration is a sliding "pot" attached to the top of the cross slide, similar to the types found in recording studios etc. This sliding?pot is wired into the two other pots that control and set the starting and finishing speeds as determined by the type of metal to be cut,? From there to the original pot on the lathe control box. There is a 3-way switch and the 2 ?start and?finish speed pot knobs on the CSS plastic control box that is adjacent to the main lathe control box. The 3-way switch allows CSS and or normal lathe and the center position isolates the CSS and the main lathe pot. It all works very well. I fitted my?own gear reduction drive unit to the lathe, that?s why I can get good torque and good cutting out at large diameters without stalling the machine. Thanks, again?may be of interest to some of the forum members. John Spain |
|
Re: diamond bits
I have one of these at home. I want to put it on my 14" Dewalt electric chop saw, if it works, it would be great. The electric is no where near as fast as the gas saw. I stopped using the dewalt much when i bought a bandsaw .Bandsaws are not as intense as a chopsaw, but chopsaw will cut axles, bandsaw wont.
|
|
Re: diamond bits
William Thrasher
Thanks I been looking for something like this my wife does not like the smell of burned carbon.? One of these blades should do the trick. Thanks again.
toggle quoted message
Show quoted text
-----Original Message----- From: stan2778@... [7x12minilathe] <7x12minilathe@...> To: 7x12minilathe <7x12minilathe@...> Sent: Fri, Jul 21, 2017 9:47 pm Subject: [7x12minilathe] Re: diamond bits
?
I use these occasionally, they work quite well. they seem to disappear from work so i dont know how long they last. Most of the guys think they are for masonry. Nope, cut steel with a standard angle grinder, dry. have one on my cordless grinder, use it like a standard cutoff. Available at lowes too.
|
|
Re: diamond bits
I use these occasionally, they work quite well. they seem to disappear from work so i dont know how long they last. Most of the guys think they are for masonry. Nope, cut steel with a standard angle grinder, dry. have one on my cordless grinder, use it like a standard cutoff. Available at lowes too.
|
|
Re: diamond bits
Mario,
You can successfully drill through 62-64 Rc hardened steels using shop made carbide spade drills. ?The spade drills I use are made from micrograin round carbide tool blanks. The geometry I use is simple but you need a means to control the grinding such as a Deckel tool and cutter grinder or clone. ?I use a Quorn tool grinder because that is what I have. ?The drill needs to be run at high speed and you cannot let it dwell in one spot or it will need to be resharpened. ?The high speed tends to soften the steel directly under the drill. Don't use coolant -run it dry. You can also buy these drills but they are expensive and they will be a one shot proposition unless you have the capability to properly sharpen. I have also used hand ground spade drills for one off situations such as cross drilling through chrome plated Thompson linear way shafting. ?I did this in my mini lathe with a hand ground carbide spade drill. I got the holes I needed and saved the day at little cost. I'm goind to see if I have one of those drills to post a photo link. Dick |
|
Re: diamond bits
Diamond hones are great for hand sharpening - the temperature stays low enough to not damage the hone. (They're made by embedding diamond powder in nickel plating.) ?Diamond drills/hole saws are a different animal. They're actually just shaped abrasive tools, so they don't cut the way a drill does, they just grind their way through. They're nice on non-metallic things, much less effective & more expensive than classic abrasives (aluminum oxide or silicon carbide) on metals.
Roy |
|
Re: diamond bits
Ian Newman
开云体育Hi Chris, An expensive experiment is to burn some [diamond] with a match This is actually a cheap and boring experiment - nothing will happen...... All the best, Ian On 21 Jul 2017, at 19:04, Chris Albertson albertson.chris@... [7x12minilathe] <7x12minilathe@...> wrote:
|
|
Re: diamond bits
wmrmeyers
开云体育Admittedly my experience ?with diamond honing of steel is all hand work, but nothing I know says diamond won't ?work. Water for coolant is the way to go. Lots of water. Bill in OKC? Sent from my Sprint Phone. -------- Original message -------- From: "Chris Albertson albertson.chris@... [7x12minilathe]" <7x12minilathe@...> Date: 7/21/17 1:04 PM (GMT-06:00) To: 7x12minilathe <7x12minilathe@...> Subject: Re: [7x12minilathe] diamond bits No, diamond will not cut metal very well.? That is because the cutting angels are random.? They cut glass and ceramic by fracturing it and metal does not fracture. There are abrasives blades that cut metal but they depend on heat and the metal glows red.? Chop saws are like that. ? A diamond would burn up in flame if heated to red hot.? Diamonds will burn just like coal, An expensive experiment is to burn some with a match On Fri, Jul 21, 2017 at 9:29 AM, Mario Mohl mario.mohl@... [7x12minilathe] <7x12minilathe@...> wrote:
Chris Albertson Redondo Beach, California |
|
Re: diamond bits
开云体育Hello John,
?
I will respectfully disagree with your comment of the drill
bits from HF (Harbor Freight).
?
Now while I did have a small drill bit set from HF?back
in the late 70's that was of very poor quality, improperly ground tips, bent
drills right out of the box,?questionable hardness -?dulled
immediately.?I know that the quality has now improved. I purchased a 115
drill bit set from HF?a while back and was very pleasantly surprised by its
quality. Now I did buy the more expensive?Cobalt drill bit?set
($109.99) fearing the quality of the lower end HSS ($34.99) or Titanium M2
coated set ($49.99). All of these prices are list every day prices, and often go
on sale and of course take off an extra 25% with a coupon.
?
I'd have no problem recommending them to anyone looking
fro a set of drill bits Michael - California, USA Micro-Mark MicroLux 7x16 LMS 3990 Hi-Torque Mill with power feed From: 7x12minilathe@... [mailto:7x12minilathe@...] Sent: Friday, July 21, 2017 9:44 AM To: 7x12minilathe@... Subject: Re: [7x12minilathe] diamond bits
If the material is not hardened, I would just use a good high-speed
steel drill.
I would not use any drill from HF since they are suspect.
John On Fri, Jul 21, 2017 at 9:29 AM, Mario Mohl mario.mohl@... [7x12minilathe]
<7x12minilathe@...> wrote:
|
|
Re: diamond bits
开云体育Those are small hole saws. They have a hollow section in the
center. And no they would not work well for drilling steel.
?
The from looking at photo at the bottom of the ad, they don't
appear to be of very high quality either, if the photos are of what you actually
get.
Michael - California, USA Micro-Mark MicroLux 7x16 LMS 3990 Hi-Torque Mill with power feed From: 7x12minilathe@... [mailto:7x12minilathe@...] Sent: Friday, July 21, 2017 9:29 AM To: 7x12minilathe@... Subject: [7x12minilathe] diamond bits
Do we think these would (reasonably) drill through HSS ?
Just curious. |
|
Re: diamond bits
Jerry Durand
开云体育Be careful sharpening carbide, it's a fine powder bonded with nickel.? Breathing nickel dust is not good, wear a mask.On 07/21/2017 11:52 AM, Chris Albertson
albertson.chris@... [7x12minilathe] wrote:
-- Jerry Durand, Durand Interstellar, Inc. tel: +1 408 356-3886 @DurandInterstel |
|
Re: diamond bits
开云体育??? ??? That is impressive Mario! I had to cut fins in an
aluminum Stirling Engine cylinder and I fabricated a blade from a
carbon steel (Chinese) hacksaw blade. Ground the end leaving a tit
on it. Heated it red and tapped it with a small hammer mushrooming
the tit. Then ground it leaving it wider than the blade. Very
effectively cut 16 fins.? Bill in Boulder CO USA On 7/21/2017 11:49 AM, Mario Mohl
mario.mohl@... [7x12minilathe] wrote:
|
|
Re: diamond bits
On 7/21/2017 12:29 PM, Mario Mohl mario.mohl@... [7x12minilathe] wrote:
Do we think these diamond bits <> would (reasonably) drill through HSS ?Bits in the link will cut hss but not drill it very deep before you are replacing it with a new. If the hss is hardened you can use a carbid drill but that isn't fun either. Tell us your plans and we can give you better help. Jim Ann Arbor |
|
Re: diamond bits
Chris Albertson
They make solid carbide bits.? Not as hard as diamond but the shape is correct for drilling metal. ? I've only used really tiny solid carbide bits for drilling holes in epoxy fiber glass circuit board material. ?? Apparently carbide bits can be resharpened. ? The set I bought was used but resharpened. ? On Fri, Jul 21, 2017 at 10:49 AM, Mario Mohl mario.mohl@... [7x12minilathe] <7x12minilathe@...> wrote:
--
Chris Albertson Redondo Beach, California |
|
Re: diamond bits
Chris Albertson
No, diamond will not cut metal very well.? That is because the cutting angels are random.? They cut glass and ceramic by fracturing it and metal does not fracture. There are abrasives blades that cut metal but they depend on heat and the metal glows red.? Chop saws are like that. ? A diamond would burn up in flame if heated to red hot.? Diamonds will burn just like coal, An expensive experiment is to burn some with a match On Fri, Jul 21, 2017 at 9:29 AM, Mario Mohl mario.mohl@... [7x12minilathe] <7x12minilathe@...> wrote:
--
Chris Albertson Redondo Beach, California |
Johannes
OldToolmaker
to navigate to use esc to dismiss