Member postings for Paul Griffiths 1

Many thanks to you both with this one. Although the stopping etc has ceased I am at a loss as why considering the fineness of the adjustments made.

It is just as well this issue showed up during the weekend otherwise, I most probably would have shelled out for a new half nut if the suppliers were open!

Most if not all my spare spondulix have been set asside for the "Black Hole" mentioned on here before.

Now I can concentrate on producing swarf of many colours and shapes from various metals until the next hiccup happens! Watch this space!

Most times a thing of beauty emerges from my doings much to my amazement and utter joy.

Best regards to all.

Paul.

Eureka! How's my Greek? I have found the cause of the Stop go, carriage issue.

Of course, I had nothing to lose in following Martins sound advice and whipping my apron off and revealing my inner parts as they say.

After washing off the rack and its mating parts reassembling and oiling nothing changed! Stop go had not been eliminated. Oh Dear!!!

There is more!

Whilst my rubber gloves where mucky and close to my wits end, I took another look at the gib setting on the half nut dovetails, adjusted the two side screws hardish up, to prevent movement then backed them off until the half nuts moved with a tad bit of friction, then locked up the two Allen cap screws again plus the two side screw lock nuts.

Guess what?

No more stop starts.

Just goes to show how promptings on the forum can nudge one into reassessing what one has already "sorted" previously to then get it sorted correctly by revisiting with "nothing to lose"

I can now get back to making some more nuts and bolts for my '72 Commando, otherwise known as the "Black Hole".

Keep up the good advice my fellow twiddlers and many thanks to you all.

Best rgds.

Paul.

Many thanks for your thoughts, folks.

I think that Martin has taken the clue vis the 3/4mm banding spaces as a source for deeper investigation hence my search for half nuts.

RDG/Myford are my first port for a phone call albeit not with much confidence of a positive immediate outcome as they aren't showing Super 7 half nuts on thier site. Considering half nuts are a fundamental must have component on any lathe, surely they should be a constant item in thier catalogue?

We'll see in the morning!

In the mean time I'll check out all of your advice found on this post and keep you informed as to how things progress.

Best rgds.

Paul.

Hi to everyone.

Thanks for your thoughts so far! To clarify, the situation is this. There isn't a gearbox on the machine, the tips are tungsten carbide the gibs are as near as dammit spot on. The carriage actually stops momentarily/hesitates
to produce the ridged finish.
The carriage will perform this activity without any work in the chuck, idling down the bed is just as bad.
If I hold onto the apron hand wheel as it is turning creating back pressure, the carriage acts normally although I sense at times a feeling of a hint of the malady is present.
To reiterate. The lead screw is in good condition and is in constant motion whilst all this is happening, yet the carriage is not following orders!
As mentioned in my original post, after spending quite a considerable amount of time scrolling through the net, Super 7 half nuts seem to be sharing the same stable alongside rocking horses' doo doo!
Does anyone have a comment on these elusive items please?
Rgds.
Paul.

Hello fellow members.

My Myford Super 7 (3/4" lead screw) has started to stop/start and hesitate as I go about fine travel machining leaving the job with grooving marks every 3/4mm along the process. Threading speeds I have no issues with?

I have had the apron off to inspect the half nut which after cleaning looks to be in a reasonable condition leaving me with no concerns. Likewise, the lead screw.

I am inclined to suspect that the half nut is the problem therefore I have serched the ususal outlets for preferably a new or pre-owned one without success.

1) Have any readers encountered this phenomenon themselves and have a satisfactory outcome?

2) Should I require a new half nut please point me in the right direction!!

Thanking you in anticipation.

Rgds.

Paul.