Search results

just make the drill - it's really easy - get a lengt of tool steel of the diameter you want, grind a D-shaped point and then harden and you are good to go

I think, if I understand your words, that you are making a mistake. you want to hold the block (the thing you are drilling) in a 4-jaw chuck wiht the place where you want the hole centered on the axis of rotation, and hold the drill in the tailstock. That way if the drill wants to wander, the...

an observation about that schematic - it is very close to the Delta Mk 10 schematic from the early 70s (late 60s?). Delta used germanium transistors for low voltage drop, in my design I used silicon, today's solution would be MOSFETS. since whatever you use is driven hard into saturation or...

I guess we are just using the terminolgy differently. The voltage across a cap is the integral of 1/C integral of I t, across an iductor it's L di/dt, when you add in resitance and you solve the differential equation you get an exponential which is readily expressed in the laplace domain ---...

it seems to me, that any voltage above some margin over the breakdown voltage across the plug gap and the operating pressure is just wasted. If I was trying to make a miniaturized spark system, that is where I'd start - use a full size ignition system with a storage scope with a HV probe, and...

could you elaborate on what you mean by "6 time constants" this makes no sense to me, particularly in this context- in the CD ignition I designed, the capacitor is charged from a bridge from a power supply that can source a fixed amount of current without saturating the transformer (and the...

you say it is hard to tell if it puts enough energy into the spark .... would it matter if I told you that the exact circuit powered my 356A for half a million miles without a problem? WRT size, my unit was built on a scrap of aluminum I had handy, probably 4 or 5 inches long, if size mattered...

it all depends on what accuracy you need. if .001 or .005 is sufficient then any sort of flat scrap will work, if .00001 matters then less so, and if you need to work in microns then you need a work surface that is to that standard. The last time I needed precision, I was fitting bearings to a...

there are a couple of much cheaper solutions, you may go to my web site (wbnoble.com) and look for my discussion of a CD ignition for my older Porsche - probably cost me $5 in parts to build. Or if you ask I will pass on info to contact a guy who has designed a new CD ignition for older sports...

I was looking on ebay trying to figure out what the above tool post is for - I haven't found that, but I found this item which I think shows your tool post complete so at least you know what it looks like, it certainly looks like it aligns with the pictures you have posted. myford tool post...

surface plates, if you have time, are not expensive. since they are heavy, they don't sell well at garage/estate sales, for example. I have a 2X3 foot surface plate which I got from ENCO at a trade show (Enco was later bought by MSC). I had a coupon, they had a show deal and there was a sale...

the auction method will make it disappear fast but yeild well under a tenth of what on-line sales yeild. For an example, look at my ebay store - it is still 2/3 or so stuff from my friends estate - the electronics is from other sources - you can get an idea. and if you look at my sold items...

just noticed you say the lathe is a 14 inch swing (I presume that means 7 inches from the axis of rotation to the ways). in that case you definately have a Crozier style 4 way tool post. I have several sitting here, I doubt it's worth shipping one to you, but here is a photo of one that I have...

I have Aloris B size on my 12" lathe, A size is ok too. I started with the cheap stuff, if you have absolutely nothing, then I suppose it will work, but for me, paying $500 or $600 for a used real aloris tool post with a couple of holders is worth it. it's the difference between having a deux...

in answer to your question, which I think is really "how can I get a good value for my workshop because I will be needing the money" if you sell it as a lot to one person you will probably get 5 to ten cents on the dollar (or however you say that in the UK). If you offer it here and other...

I agree with Clark - at least in my garage shop, I use cutting oil, way oil and whatnot and oil gets all over the machine anyway, a little spillage oiling the oil points is nothing. I don't clean it often on the basis that the oil protect it from rust (or maybe that I'm to lazy or don't have...

now that I have time to look carefully at the mounting, you have half of a 4-way tool holder there. you cannot install a typicla Aloris style holder onto that. Can you get more photos of it and how exactly that part with the thread is attached to the lathe compound? If it goes into a T-slot...

FWIW, from a friend's estate, I still have an ammo can of aluminum holders he made for holding 3/16 and 1/4" HSS bits for sharpening. He targeted these at the wood turning community but I don't see why they won't work for metal working also - I haven't posted them in the FS section because I'm...

Today at 2:45 AM If that engine is to pump anything, it should be the ingredients for a pan-galactic gargle blaster. Anyway, you can't use an improbability drive to make tea - that would be perpetual motion. Pete Twissell, Engine builder, motorcyclist and general machine botherer. if we were...