Rexon PD500 mill drill – how to separate column from head

Advert

New Replies

Report Bug

Help/FAQs

Rexon PD500 mill drill – how to separate column from head

This topic has 11 replies, 7 voices, and was last updated 11 January 2017 at 09:56 by Michael Gilligan.

Viewing 12 posts - 1 through 12 (of 12 total)

Author

Posts
9 January 2017 at 07:55 #12854
Andrew Hutchinson
Participant
@andrewhutchinson12802
Column rotates but won’t drop out
Advert

9 January 2017 at 07:55 #276693
Andrew Hutchinson
Participant
@andrewhutchinson12802
Hi Folks,

I have an '84 Rexon RD500 mill drill that needs dismantling. When I pull on the column I can't yard it out of the headstock. It is a bit sticky and doesn't rotate all that well on account of the 30 year old grease but it doesn't want to pull out of the bore. A little liquid wrench and it rotates easily but again it won't budge dowwards. What I am wondering is if there is some retaining bolt/screw that I am missing. Maybe just another night of liquid wrench and more oomph on the pull? I had a bound volume of 1983/84 ME magazines and it looks like the mill is similar to the Naerok brand just going by pictures.

Thanks for any pointers,

Andrew Hutchinson

Surrey BC Canada

Edited By Andrew Hutchinson on 09/01/2017 07:56:53
9 January 2017 at 09:43 #276701
Ian S C
Participant
@iansc
I'v got a Rexon 400 but no info. It is the same as the Naerok, I think it's known as that in UK, just Korean backwards. If not the same yours will be very similar to mine, and I'm always looking for info.

Ian S C
9 January 2017 at 10:10 #276706
not done it yet
Participant
@notdoneityet
What normally holds it tight in position when in use? Through bolt(s) or clamping set screw or bolt? A pic or two?

If a clamping bolt, spread the slot with a wedge? Just guessing.

Fix on something to give it a jolt -similar to a slide hammer?

Heat the headstock and cool the column?

Tell usa bit more.
9 January 2017 at 12:03 #276724
Vic
Participant
@vic
It may have wedges that retain the head as on a pillar drill? On my drill I've had to drive the wedges out in the past in order to get the head off.

Thinking about it, the early mill drills that came over here like the Naerok had the column fixed to to head and the whole assembly would go up and down through the base using a rack and pinion.

Later machines have the column fixed to the base and just the head goes up and down on the column.

Which type do you have?

Edited By Vic on 09/01/2017 12:35:43
10 January 2017 at 11:09 #276932
Ian S C
Participant
@iansc
The Rexon is the former, the head is fixed to the column. there are two 12 mm (I think) bolts that close the clamp around the column. I tried taking the head off when I needed to move the mill about twenty years ago, but had no success. I unbolted the column from the base, then spent hours re tramming the mill after I reassembled it.

Ian S C
10 January 2017 at 14:40 #276965
Andrew Hutchinson
Participant
@andrewhutchinson12802
Thanks all,

It' as Ian says: column goes up and down. Trying to get it on the stand and need the headroom that removing the head would provide. In this case the base is already separate. We'll see how it goes.

Andrew Hutchinson
10 January 2017 at 15:28 #276973
Vic
Participant
@vic
Good luck. Let us know if you manage to get the head off, it may help someone else.
10 January 2017 at 17:19 #276985
john fletcher 1
Participant
@johnfletcher1
I have a Naerok 350 which is RDM 350 and have had the machine in pieces several time to carry out modification. I also have a sale brochure and an exploded view neither of them show how to remove the head. On the exploded view there is so much detail, such, that its pretty useless. I think there is stud with a lock nut on the left hand side of the head when viewed from the front which retains the head. I remember when I took the head off I had the machine on the workshop floor with the base attached. I'll be in the workshop tomorrow afternoon and have a good look to see how my head comes off and then let you know. John
11 January 2017 at 05:46 #277052
Andrew Hutchinson
Participant
@andrewhutchinson12802
Hi again,

In the end it was paint!

Two evenings of spraying liquid wrench and pulling and it finally gave in. It seems they bored, primed, planted the headstock on the greased column and then, then sprayed the headstock green. It's stock paint so no malicious owner involved. My routine was to spray, wait a couple of seconds, then rotate and pull with my boots on the HS flange. At a quarter turn per go it took a while but eventually the remaining primer dissolved in and around the collars of the headstock casting. Looked pretty funny but it worked. I saw the green paint early on and removed most of it with an 1/8" stick of brass but didn't see the primer until it was almost off.

I'm pretty lightly built but do manual labour so these things aren't usually so much fuss – this one nearly had me beat… I'll give credit where credit is due!

I should also note that where it enters the headstock the column casting also had three or four small divots where there was too little material to turn/grind off but I think these were filed back well enough not to cause an issue. They're shiny like a high spot but since they were not in the flange area I don't think they caused the stickiness.

One last question if I may, The column has about an inch of core sand mounded up on the fore and aft sides of the column tube – Should I remove this? Does it have some remarkable damping quality? Looks like an entrance to the secret world of OG when viewed on end. I've started to scrape the base where the column joins up and I can see the sand will go everywhere when I scrape the column base into the base. I say this under the assumption that they're not miles out. There were shims on the left hand and front side corresponding to paint blobs in the opposite corners.

Other than that the machine is pretty nice for a beater. Took some decent (to me anyways) cuts under power before purchase.

Andrew Hutchinson

Surrey BC Canada

Edited By Andrew Hutchinson on 11/01/2017 05:46:53
11 January 2017 at 08:31 #277060
Circlip
Participant
@circlip
"One last question if I may, The column has about an inch of core sand mounded up on the fore and aft sides of the column tube – Should I remove this? Does it have some remarkable damping quality? Looks like an entrance to the secret world of OG when viewed on end."

This is due to the country of origin exporting itself. When enough sand has been deposited at the destinations, said originators will declare squatters rights and political asylum. Taiwan did this years ago and the same trick is now being tried by China and India and is explained in the notes on the casting sheets.

Regards Ian.
11 January 2017 at 09:56 #277074
Michael Gilligan
Participant
@michaelgilligan61133
Posted by Andrew Hutchinson on 11/01/2017 05:46:10:

… There were shims on the left hand and front side corresponding to paint blobs in the opposite corners.

.

Maybe the "fitters" are not allowed access to sharp tools.

Hopefully, your dedication to the job will be rewarded.

MichaelG.
Author

Posts