Member postings for thaiguzzi

At the risk of a public flogging, I have a question from across the pond. The only Tea I have experience with is Lipton, is that anything remotely like what You Chaps drinkg?

ega

If downwards projection of the toolbit is an issue with tangential holders the simple answer is to switch to an Armstrong style!

As the video linked in the first post implies, but doesn't actually state, at the cutting edge tangential and armstrong tool holders are functionally identical devices. The only primary difference is that the armstrong bit requires two grinds for most tool shapes whilst the tangential bit gets away with one. If you have the grinding jig. The armstrong bit also consumes its cutting edge at every grind so it gets narrower and shallower over time whilst the tangential tool regenerates the edge in the same place with every grind. Of course an armstrong bit does not need a jig, although a simple angled fence can be helpful, and sharpening on the front of the wheel using the hollow ground method is trivially simple.

The real genius behind the Eccentric Engineering tangential toolholder was the realisation that the toolholder and uber simple sharpening jig combination added up to a price / performance / perceived value ratio corresponding to a successfully marketable product. Realising that there was also a touch of "new to this generation" novelty to provide serious marketing impact and keep the idea fresh was important too.

Well done that man. Seriously. Heck I almost bought one.

Fact is an equivalent simple, one universal angle, sharpening jig can be devised to use with armstong holders. With equally effective results given a simple half page instruction sheet explaining the hollow grind on front of the wheel method and how to hone the tool to keep it sharp. Possibly a footnote on packing up for various rake angles too. Which pretty much don't matter for the home shop guy so long as the thing is sharp and has some clearance.

But no one has ever made a go of a lathe tool sharpening jig for home shop guy. Southbend tried but theirs was too clever and too complex. Good tho'. Price / performance / perceived value being all wrong for a commercial product especially with everyone saying its dead easy to grind an ordinary tool. Which it is if you have someone to show you but un-mentored and working from books is a different matter if things don't click quickly. Especially if you don't know how much of a cut you ought to be able to peel off with a sharp tool. I've yet to see a written description of basic lathe tool sharpening that rates better than not very good from the solo novice viewpoint.

Doesn't help that the Americans never officially seemed to twig that the rocker in their obnoxious lantern tool posts is unnecessary when an armstrong is used. Simply roughly shim and change the tool bit projection for fine height adjustment. So the poor old armstrong system got tarred with the lantern brush.

Clive.

Edited By Clive Foster on 20/01/2019 13:54:32

In between trying to get the Chester mill motor off I have been making up a backsplash guard for the Myford Super 7.

Needs a bit more work to route the DRO cables and provide safe power to the DRO but basically finished it today. Fitted the DRO scales about 12 months ago and this is the first time I have powered them on. The display came of the Myford 7 I recently sold.

I need to fit the DRO modification to put the magnetic scale under the cross-slide but need the mill to do this or get my mate to do it on his Hauser jig borer.

Colin

Well a big thank you to all for helping with my question. I went out to the workshop but found that I had no silver steel. As it's Sunday I decided to have a go at turning it straight down from a piece of 6mm brass as suggested. I shocked myself with a first time success! It seals better than the original item. I was mindful of the information regarding the lack of strength of the core metal but it seems OK, also bearing in mind that it never really has any load on it.

I don't know how they made them but I bet the process never modernised from the original. So maybe they were always turned

Thanks again all. That's another piece of history back on the road. It's a Moto Guzzi Superalce by the way. Built for the Italian army from 1946 to 1957.

Plus 1 for Bisley

There was an article in MEW showing how to make your own for those so inclined. We had a bought one at work and it was very good.

Came across a post here regarding the high cost of deliveries from England to anywhere else,often much more than the cost of the items involved.

I have experienced this many times,item value £10 delivery £13/14.

Needless to say,that,s a non-starter.

Strange to say,not all suppliers seem to be bound by this creed,very odd !

Wonder what the position will be after next year ?

Watch this space ?

Could I recommend a visit and chat with Chris and/or Steve at Home And Workshop Machinery? No obligation to buy but lots of advice and demonstrations of non bodged second hand machinery. They've currently got some Boxfords in which apart from the colours, are in good condition with no "disappointments" lurking for the unwary. Also a good selection of all other makes. They're in Sidcup, Kent.