Author Topic: Raglan mill help  (Read 649 times)

Offline scc

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Raglan mill help
« on: February 09, 2019, 06:14:33 PM »







Hi All,    My Raglan mill is in need of new leadscrews/nuts on it's x/y axis. I got away with it on the big Burrell but  cannot cope with the smaller stuff...locking gibs and adding/subtracting numbers to dials is not on :ShakeHead:
I am unsure about making new myself (the long one is to long for my lathe anyway. Thread is square 0.625 inch dia X 8 tpi, one of them is left hand. Are parts available?
Any ideas?







raglan

Online steamer

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Re: Raglan mill help
« Reply #1 on: February 09, 2019, 08:13:38 PM »
Is it the screw that is gone? or the nut?
Or both?

Dave
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Online crueby

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Re: Raglan mill help
« Reply #2 on: February 09, 2019, 08:22:10 PM »
From the bottom photo, it looks like at least the screw thread is gone, the threads look very thin in the middle, that machine has made lots of swarf in its day to wear that much!
I don't know about full parts, but threaded rod and nuts are available from commercial suppliers - that looks like an Acme thread?

Online steamer

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Re: Raglan mill help
« Reply #3 on: February 09, 2019, 08:30:44 PM »
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Online steamer

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Re: Raglan mill help
« Reply #4 on: February 09, 2019, 08:38:02 PM »
My thought is to document what is there completely.   Then purchase some threaded ACME Lead screw blank material.    Cut the old stub ends, and bore out for a close loctite fit and turn the OD of the threaded stock to fit.   Loctite them together and that takes care of the screw.

The nuts can be done similarly by boring the old nuts to accept a new nut loctited into place. 

Dave
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Online steamer

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Re: Raglan mill help
« Reply #5 on: February 09, 2019, 09:21:08 PM »
If a lathe big/Long enough to do this isn't available SCC, and you're stuck,I'll do it for you.

I have a 9 x 36" and a 12 x 39"

Dave
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Offline Bluechip

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Re: Raglan mill help
« Reply #6 on: February 09, 2019, 09:30:48 PM »
I have no knowledge of Raglans, lead-screws et al ... but .... ages ago ( about 8 yrs.-ish ) An acquaintance was involved in a CNC engraver / wood-butchering device and I think he sourced some lead-screws from here:

https://www.automotioncomponents.co.uk/en

No idea if this helps or not ...  :headscratch:  :old:

Dave

Offline scc

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Re: Raglan mill help
« Reply #7 on: February 09, 2019, 11:35:52 PM »
I like the Loctite idea Steamer Dave
Bluechip Dave,  thanks for the uk supplier info
At first glace I think the cost might put me off but will look into it.

Thank You all for help               Terry

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Re: Raglan mill help
« Reply #8 on: February 10, 2019, 01:22:54 PM »
The stock from Roton was not that expensive.  Shipping and VAT might be....

Dave
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Offline Jo

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Re: Raglan mill help
« Reply #9 on: February 10, 2019, 02:16:59 PM »
Lathes.co.uk do nuts, they probably also can point you in the direction of leadscrew suppliers.

Eric reckons it will cost more than the mill is worth  :(

Jo
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Offline scc

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Re: Raglan mill help
« Reply #10 on: February 10, 2019, 08:00:59 PM »
Eric could well be right Jo.     I've been looking in to it and I reckon I could buy some Acme taps and make new nuts.    I also think I could screwcut a new short shaft (the left hand one).  Looking closely at the long shaft and measuring flank thickness I think it will be OK with just the new nut.    I know it's an old machine but what could I replace it with and at what cost?          Terry

Offline pgp001

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Re: Raglan mill help
« Reply #11 on: February 10, 2019, 10:58:34 PM »
Why dont you add some DRO kit to it. That will overcome the problems with the worn screws.
They are available at very reasonable cost these days.

Phil

Offline Admiral_dk

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Re: Raglan mill help
« Reply #12 on: February 11, 2019, 12:20:40 PM »
I put a DRO on my lathe for similar reasons - this works nicely in regard to moving a distance, but not so well in regard to finish to the surface I'm doing with the lathe …. so a DRO isn't a complete solution in it self.

Offline Steamer5

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Re: Raglan mill help
« Reply #13 on: February 11, 2019, 01:15:48 PM »
Hi Terry,
 Think I've mentioned before my Dad has the same mill.
He brought it from a guy who had refurbish it. I'm not sure what was done to it, I'll ask Dad if he can remember, hes had it for quite awhile &  :old: age is creeping up on him.

On the cost front...well its either fix what you have, OR buy a replacement! I guess you could sell off the Raglan as parts to offset the new mill but I think that would be a pity!  NO I'm not looking at buying yours for spares! The cost to get it here would be horrible!

Cheers Kerrin
Get excited and make something!

Offline scc

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Re: Raglan mill help
« Reply #14 on: February 11, 2019, 09:27:20 PM »
I have had a play with the lathe and had the right change wheels for once. So I can cut a LH 8 tpi :whoohoo:  Next job is to make a suitable cutter and see what happens. If all goes well I shall order the taps for the nuts.
Thank you gents for the dro thoughts...might need to do that as well but probably only on the "modified digital caliper" route due to my limited budget.            Cheers     Terry

Offline Florian Eberhard

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Re: Raglan mill help
« Reply #15 on: February 11, 2019, 09:39:54 PM »
Hi Terry

To me it looks as if the long screw would still be in pretty good shape - maybe just a wrong impression? But I would check that out before looking for a new screw.
The front one defenitely needs to be replaced.
Now, maybe you could adapt the acme screws (Spare parts...) from another (chinese) milling machine - for example the BF20 Design for your machine?

The Reason why i would think about htat is that - although the chinese acme screws also will not be the most accurate ones - they are most likely more accurate than a standard precision acme screw. (Which are allowed to have 0.3mm deviation per 100mm length in european "standard precision)
This is quite a lot for a milling machine - expect if you are going to use a DRO - then it won't matter. But otherwise you won't get too happy with a standard screw.

Another benefit would be that you will also get a spare nut which fits to the leadscrew...

Cheers Florian

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Re: Raglan mill help
« Reply #16 on: February 11, 2019, 10:06:49 PM »
Florian
True that, but with a dro, its less important.   Some screw stock on this side is better than others.
Dave
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Re: Raglan mill help
« Reply #17 on: February 11, 2019, 10:12:53 PM »
 Terry    if your lathe will cut that acme.  Just do it.   8)
Dave
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Offline scc

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Re: Raglan mill help
« Reply #18 on: February 12, 2019, 09:16:30 PM »
First practice on some scrap bar and a cutter ground by eye :ShakeHead:    Necessary before I spend money on taps.    I need to set up a carraige stop to make it easier to pick up the start point for every cut, and obviously grind a tool correctly.

I am not entirely convinced that I am dealing with an acme thread :thinking: Looking at an unworn end the thread flanks look parallel..a square thread? Surely an acme won't wear that way.   Unfortunately I do not  possess a good enough camera to show it. Would a square thread have been used?  More advice needed,

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Re: Raglan mill help
« Reply #19 on: February 12, 2019, 09:28:38 PM »
First practice on some scrap bar and a cutter ground by eye :ShakeHead:    Necessary before I spend money on taps.    I need to set up a carraige stop to make it easier to pick up the start point for every cut, and obviously grind a tool correctly.

I am not entirely convinced that I am dealing with an acme thread :thinking: Looking at an unworn end the thread flanks look parallel..a square thread? Surely an acme won't wear that way.   Unfortunately I do not  possess a good enough camera to show it. Would a square thread have been used?  More advice needed,

A square thread is a possibility, but square threads are thread milled in general.   For the replacement, I would go with an Acme.    If your convinced that you want to turn your new screws, I would get the tap, and tap a small piece to make a gauge...    then you can cut it to fit nicely.   

Dave
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Damned ijjit!

Offline scc

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Re: Raglan mill help
« Reply #20 on: February 12, 2019, 10:02:02 PM »
Thanks Dave,      I think that's the way to proceed.

Terry

Offline Steamer5

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Re: Raglan mill help
« Reply #21 on: February 13, 2019, 11:39:15 AM »
Hi Terry,
Looking good!
I spoke to my Dad last night about his mill. He cant remember what was done to it prior to him purchasing....given he's pushing 92 & he's had the mill he thinks 20 odd years not surprising really! The guy that did the refurbish is still around but lives 450 km's away, I'm sure he could help out.

I'll give Dad a call & ask if he can work out if the thread is square or Acme, & just to make sure I've got it right you are looking at the X & Z axis threads?? I'm off on holiday latter today......I'm at work ( Oooooooo he used THAT word    :Mad: :cussing:) & its a bit after midnight here...but will endeavor to get you the info ASAP!

Cheers Kerrin
Get excited and make something!

Offline scc

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Re: Raglan mill help
« Reply #22 on: February 13, 2019, 05:34:51 PM »
Cheers Kerin but I am going for the acme whatever.
Have a great holiday and give my best wishes to your dad.

Terry

Offline Steamer5

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Re: Raglan mill help
« Reply #23 on: February 14, 2019, 04:30:51 AM »
Hi Terry,
 That’s fine, when I told him that you had built a 4” traction engine on yours & that he would have to up his game, he thought you were very keen! Will pass on your wishes.
Look forward to how you get on with the refurbishment

Cheers Kerrin
Get excited and make something!