Member postings for larry phelan 1

Hi Old Mart,

Just been checking out those holders on Ali Express. They sell them as boring bars, but of course suitable for grooving as well.

Surprise, surprise, the cost of postage is more than the cost of the item itself !

Came across this a few times before. At least I now know what I,m talking about and looking at.

Good morning everyone,

Such a lot of new information and all helpful. Yes, it seems that clearance is the big problem and setting on centre height may not be the best idea either [so much to learn ! ]

To Old Mart, where did you buy those grooving tools ? I never knew such things were available.

Neil, I think you may have put your finger on it alright ! Perhaps you have "Been there ,done that, and ruined a teeshirt ?"

There is plenty of food for thought here and I will attack the task again, a lot wiser this time around.

Thank you one and all for your time and patience answering my silly questions.

Martin,

My thanks for your input, it arrived just after I had shut down.. Yes I was using cutting fluid, but I take your point regarding side clearance.. The overhang from the toolpost was kept as short as I could, I know the danger there, but perhaps I could go for a bigger dia bar, plenty of room for one.

All food for thought and all welcome. One thing did occur to me, does the same situation not arise when cutting grooves for circlips?

Plenty more for me to experiment with !

Again, my thanks to everyone.

It,s not so much the size of the groove, more the difficulty of cutting it. When the tool begins to rub instead of cutting, you know there,s something wrong.

No 0ne mentioned speeds, but since I tried many different speeds with no effect, I presume speed is not a factor

I know that form tools are hard on machines, as PGK points out [found this before ] and I did think about using a narrower tip, again very much like the problems when using a wide parting or grooving tool on outside work.

Not sure what bearing the bore size would have as long as the tool had plenty of room to operate.

This was more a case of "How to" before it became a case of "Need to ", It,s nice to know how to do these jobs in advance.

There is a lot more to learn here, but in the meantime, my thanks to all who offered help.

For my first attempt, I did use a square shaped tip but it did not cut very well, that,s why I thought it should be rounded. What I really want to know is why the tool rubs rather than cuts. As I said, very similar to the way parting tools do at times. Is my speed wrong. The bore is 40mm, and I might add that this exercise is just to learn how to do the job, not for any real job.

My brain is cooked too, but that,s from sitting too long in the sun on this beautiful day.

Will leave the Maths for later, much later.!

The vibes will only worry me when I see the chuck spinning down along the bed !

Good evening all,

I am looking for advice regarding the cutting of internal grooves for o rings. The groove in question needs to be 3mm wide, so I made a cutter or tip 3mm wide and rounded the end. Fixed this to a shaft, something like a boring bar and proceeded to cut the groove, having first bored out the workpiece.

The problem is that while the cutter makes a start on the job, cutting fairly well, it soon starts to rub, very similar to the way a parting tool behaves at times..

I tried several different speeds, which made little or no difference. Checked that the tip was set at centre ht and that the projection fron the tool post was not over long, in order to avoid flexing or springing. All to no avail.

I have no doubt I have missed out on something and someone out there knows what !

Any ideas ?

I spend my money on good Irish Whiskey, can,t do much better than that !

I think very few small lathes like form tools of any kind, has been my experience anyway.

Would love to hear the feed back on this one !

I have a similar gear waiting for repair.

Sad to say, my Lux machine remains as naked as the day it was made.

Not sure what the workshop police would have to say about that set up !

You might also try Drills UK.

I have bought from them several times and found them good to deal with.

I was given a large piece of granite worktop when a friend fitted a new kitchen.

This thing is as big as a double sink and about 40mm thick.

Not tool room quality, but a lot better than my bench top [when I can see it }

Just as a matter of interest, how or why is the key moving ?

Is it the wrong size ? Why is the screw not clamping it in place ?

I use inserts like that for parting off. Bought the holder and inserts from China, made a holder to suit my back mounted tool post and the whole thing works OK, well most of the time anyway.

Would not ever consider parting off that far from the chuck.

As an aside, my lathe does not like 3 or 4 mm inserts, but seems quite happy with 2mm ones, so I stick with them.

Happy parting off !

Oh You are awful ! I hate you- I hate you- I HATE YOUUUU !

You need to remember that machines are sent out with little or no inspection despite what the seller tells you.

You have only to read some of the posts on this Forum to see that.

Cars are not much better. It pays to check EVERYTHING before using any machine.

The suppliers goal is to Get it out---Get the money in ! Full stop !

You don't believe it ? Read a few posts on this Forum and you might see things in a different light.

Don't even ask how I know.

I solved that problem many moons ago by keeping my welding rods in the hotpress.

S-W-M-B-O objects from time to time, but I suffer from deafness from time to time, as required, so it,s not really a problem.

The good news is that the rods remain dry and the flux never breaks away, so it,s worth a try.

Rods kept in a cold workshop seldom perform well

Wrap them up in a tee shirt and say nothing about them.

Taking on board the good advice offered by so many Members, I scrapped my first attempt at a dept stop and up graded the whole thing.

The end result has been much more satisfactory all round, with the error being reduced from 6 or 8 thou to I or 2 thou, which is good enough for my needs

I would like to thank everyone for their input.

I will try and put photos in my album [sometimes it works, sometimes not ]