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Re: (unknown)
MERTON B BAKER
锘�
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Yep, & we'll need telepathic powers to figure
out what.
�
Mert
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Re: tailstock Cam lock kit and F/O/R switch change
MERTON B BAKER
Swapping switches is a simple soldering job if you
know how to work on circuit boards.� The TS camlocks營 made for my 7x
lathes work very well, and I'm sure the LMS ones will, too.� LMS is a very
reliable bunch.
�
Mert
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Re: Horsepower Resistor
I am trying to by a .025 plugin horsepower resistor for a KBCL-240Dboard.I found some on US ebay for $5 but postage to Australia is $26. Just unsolder the old one from the board, Jaycar etc will sell you a new resistor (5W IIRC) for under 50 cents. Jaycar won't have the 0.025 ohm one, 0.022 will be their closest (5% tolerance). Farnell or RS will sell you a 1% or 2% version if you really need it. (I have my doubts they're 1% ones anyway.) Tony |
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Re: Newb question about 1/8" cutting tools
MERTON B BAKER
I was lucky that way, having taken Machine tool Lab at tufts in order to
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avoid flunking Math 2, and the first thing taught there was "How to grind your own lathe toolbits." We were all given a #" long piece of 3/8" sq HRS, & told to grind the same shape on each end as was shown in prints in the textbook. With that accomplished, we were given a grade, (I got A) and a 1/4" HSS tool blank, told to make a real lathe tool, and never to complain if it didn't cut well when we were using the lathes. I still have mine, and used the same teaching method when, long afterward I was given the metal shop class in the HS where I was teaching Physics, the regular shop teacher having quit. Toolbit grinding is a basic skill for making things on engine lathes like the 7xs. The size for which they are best adapted is the 8mm, or 5/16" one. While it is true that ready formed toolbits are available, they cost 5-10 times what the blanks do, and money is useful for many other things. Those with an understanding of spatial relations plus a good 6" grinder can easily pick up the skill to grind toolbits, and I have taught many, many others, who lacked this talent, to be skilled toolbit grinders. That, however, is another story, & "Mert's toolbit grinding course, with text & visual aids" is available off list. Fair warning, it is not free. I'm below the poverty line, despite having bought all my toys when I wasn't. Mert -----Original Message-----
From: 7x12minilathe@... [mailto:7x12minilathe@...]On Behalf Of cptwinderatgmaildotcom Sent: Saturday, February 02, 2013 7:17 PM To: 7x12minilathe@... Subject: [7x12minilathe] Newb question about 1/8" cutting tools When I purchased my lathe, I also purchased a few sets of cutting tools: The first ones, the carbide, are completely junk. None of the angles are correct. It is almost like the carbide was brazed on upside down. I have had decent luck with the HSS cutters in the second set. However, they are so small 1/8", you have to use the holders. The holders cause the cutter tip to be a significant distance from the tool post decreasing rigidity. Does anyone else use the tinny cutters and if so what holders do you use? Thanks, Jeremy ------------------------------------ Yahoo! Groups Links |
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Re: Horsepower Resistor
I'm reasonably familiar with KB's website, Den, having used it to find UK distributors.
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If all else fails, you could make one up yourself. Ceramic cased, 0.1 ohm 10 watt wirewound resistors seem pretty readily available, and four of those in parallel would give you 0.025 ohms. They would handle 40W, which is probably an unecessarily high rating for the job, but there's no harm in that. Andy --- In 7x12minilathe@..., Den Strods wrote:
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Re: Horsepower Resistor
The "dealer finder" on the KB Electronics website shows a single distributor in Australia:
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Country/Area: Australia City: Seven Hills, NSW Name: ABB Australia Pty Limited Phone: 02-9674-5455 Fax: 02-9674-2495 E-mail: sales.au@... Web Site: www.Baldor.com.au Product Line(s): AC & DC Drives Stocking: This is a stocking distributor Andy --- In 7x12minilathe@..., "Den" wrote:
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Horsepower Resistor
Den
I am trying to by a .025 plugin horsepower resistor for a KBCL-240D board.I found some on US ebay for $5 but postage to Australia is $26.
Is there some place that sells these with reasonable postage to Australia. I have probably missed the obvious. Cheers and thanks for your help. |
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Re: tailstock Cam lock kit and F/O/R switch change
锘�
Mike wrote....... I did not use a camlock, instead I made another nut
higher than the original and drilled and tapped in several places for a lever
handle.......
听
I didn't make a camlock. I used a ring spanner, the
type with an angle to the handle for hand clearance. Used upside down, it does
the job perfectly, clearing the compound slide and staying in
place.
Cheers.
听听听听听听听
Ellis |
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Re: Newb question about using the apron hand wheel.
开云体育听 The SIEG and I believe the Real Bull 7x machines, with their default 20/80/20/80 (A, B, C, D) fine feed gears installed, works out to a whopping 256-tpi for power feed. This is all assuming a U.S version 7x with the 16-tpi leadscrew.听Anyway, 1 / 256 = ~.0039" advance of the tool per revolution of the workpiece. So round up and call it .004" tool advance per workpiece revolution. 听Theoretically, if a super sharply pointed threading tool were very lightly applied in this "fine feed" mode, with a depth of cut (DOC) of perhaps lets say .002" or something, you could then take a good thick magnifying glass and see this super fine & shallow 256 tpi "thread" that is cut in fine feed mode. 听To make those tiny grooves go away you'd need a rounded tip turning tool that is at least equal to or wider than that .004" spacing per revolution. Shave off the peaks between the valleys, so to speak. 听Luckily, .004" is not exactly huge even on the older most underpowered 7x mini-lathes, and a number of people have ground various configurations of rounded tip turning tools that give a pretty darn good finish. It is late as I type this so I welcome anyone who wishes to to add please links to good examples of good home ground smooth turning tools designed for these 7x machines. 听Another path I've seen taken is to add a really slow gear motor to the end of the leadscrew - (the normally driven end of the leadscrew is left in neutral or is otherwise disconnected from the change gears, and the right end is then driven very very slowly along with a gear motor. I know came up with a super fine feed version this way. (Scroll down the page and look for the photos with the gear motor on the right hand end of the leadscrew). This goes independently of spindle speed, so he reports a super fine almost polished look by going this way. Very slow, very patient, exceedingly fine, fine feed is possible. 听Then of course there is simply going very slowly along with the hand wheel, or adding a hand wheel to the end of the leadscrew where Varmint Al has the gear motor. Knowing that one full turn of the leadscrew = 1/16" can make for some carefully measured spacing & placement of the lathe cutting tool, as well. Precise even. 听And that is about everything I can think of on that subject at about 2:30 am after a long Saturday. :-) 听Cheers, 听John Z., York, Pa. USA. On 2/3/2013 1:23 AM, michael kolchins
wrote:
听 |
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Re: tailstock Cam lock kit and F/O/R switch change
Can't help with the switch but might help with the tailstock. I did not use a camlock, instead I made another nut higher than the original and drilled and tapped in several places for a lever handle. I made the nut about 1" high I think,I'm not near the shop to look at it.Then tightened the nut and marked it for where I wanted to have the handle.I drilled and tapped for 1/4-20 thread at my mark and also another at the left and right of the first tapped hole. The second and third tapped holes were for just in case I might need them to tighten or loosen the tail stock.This worked well for me so I did the same thing on my larger lathe,10x22.You won't need to touch the tail stock ,just make the tall nut and lever handle. You can use round stock or hex stock which I used.Round 听stock would need at least two flats
milled so a wrench can be used if needed.I can only think of a couple of times I needed to use the wrench to tighten the tail stock. Both times I was drilling a large bore in 听aluminum bronze and the tail stock slipped a bit. mike
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Re: Newb question about using the apron hand wheel.
When ever possible use the power feed and make sure the cutter is ground sharp and the leading edge honed.Take a stone,diamond stick or whatever use use for honing and round the sharp point you ground for a better finish. I won't go into the various cutter configurations. You can find them on the web,LMS, Sherline Tools ,or just google lathe tools.You can get a mirror finish on most metals if the cutter is ground correctly,correct speed, etc. mike
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tailstock Cam lock kit and F/O/R switch change
开云体育HI All! 听听听 I've been making some parts lately and have had some luck selling them as well.听 Enough to buy some new hop-ups for my 7x12 Cummings lathe :-) 听 My F/O/R switch is acting up, and I'm thinking that I'd rather have a rotary type switch instead of a toggle, like the one that's on the micromark 7x14... anyone make this swap?听听 I'll probably just wind up going with a stock replacement, unless the swap is easy? 听 I'm also thinking about a Tailstock cam lock kit.听 I see LMS has them for $30...听 Does the cam lock kit rally get the tailstock clamped down tight enough so it doesn't move?听 will installing this kit throw off he alignment of the Tailstock?听 My TS is perfectly aligned right now, I really dont' want to go through that trouble again of lining it back up... or worse I really don't want it to be thrown out of alignment higher or lower :-( 听 thanks! 听 Mike B |
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Re: Newb question about 1/8" cutting tools
开云体育I second the QCTP setup....听 I got one last year and I honestly don't know what I'd be doing without it right now.... 听 From: 7x12minilathe@... [mailto:7x12minilathe@...] On Behalf Of Jim Dunmyer
Sent: Saturday, February 02, 2013 8:42 PM To: 7x12minilathe@... Subject: Re: [7x12minilathe] Newb question about 1/8" cutting tools 听 听 Jeremy, Do yourself a huge favor and get a QCTP setup from LMS. See: for their selection; I don鈥檛 know which one you need right offhand, but they鈥檙e very helpful if you ask. While you鈥檙e at it, buy a few HSS toolbits and grind them according to your needs. 听 听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听 <> 听 From: cptwinderatgmaildotcom Sent: Saturday, February 02, 2013 7:16 PM Subject: [7x12minilathe] Newb question about 1/8" cutting tools 听 听 When I purchased my lathe, I also purchased a few sets of cutting tools: |
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Re: Newb question about using the apron hand wheel.
stephendyahn
I sometimes hold the wheel with both hands!
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--- In 7x12minilathe@..., Jeremy Winder wrote:
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Re: Newb question about 1/8" cutting tools
With a QCTP holder, I took a piece of 5/16" keystock and milled an 1/8" groove:
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After I did that, I saw on one of my favorite sites the guy did a similar thing: Lot of cool stuff on his page. his is a guy that uses his shop for a living so he fairly prolific in ideas and gizzmos For instance those Aloris asian knock off cut-off toolholders for the QCTP: Roy wrote: Most of the cheap brazed carbide stuff is junk! It's frequently salvageable with a little grinding to improve the relief angles. Still, it'll have a 0茂驴陆 rake angle, so, it plows rather than cuts. |
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Re: (unknown)
--- On Sun, 2/3/13, MERTON B BAKER wrote:
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Re: Newb question about 1/8" cutting tools
--- On Sun, 2/3/13, Jim Dunmyer wrote:
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Re: Newb question about 1/8" cutting tools
Most of the cheap brazed carbide stuff is junk! It's frequently salvageable with a little grinding to improve the relief angles. Still, it'll have a 0掳 rake angle, so, it plows rather than cuts.
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The stock lathe supposedly is intended for 8mm tool bits, 5/16" is close, 1/4" with shims is easier. There's a JWE mod to relocate the top slide pivot to improve rigidity - I did it years ago & have been pleased with it. Roy --- In 7x12minilathe@..., "cptwinderatgmaildotcom" wrote:
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Re: Newb question about 1/8" cutting tools
Jim Dunmyer
开云体育Jeremy,
Do yourself a huge favor and get a QCTP setup from LMS. See:
for their selection; I don鈥檛 know which one you need right offhand, but they鈥檙e
very helpful if you ask. While you鈥檙e at it, buy a few HSS toolbits and grind
them according to your needs.
听
听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听听
<
听 From: cptwinderatgmaildotcom
Sent: Saturday, February 02, 2013 7:16 PM
Subject: [7x12minilathe] Newb question about 1/8" cutting
tools 听
听
When I purchased my lathe, I also purchased a few sets of cutting
tools: |
maschwiebert
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