Needs Pictures: 0
Results 46 to 60 of 104
-
24th Jun 2020, 10:16 PM #46Golden Member
- Join Date
- Sep 2009
- Location
- Sydney
- Posts
- 666
BaronJ, definitely no adjustment screw on the back side of the gib. It’s actually a bit annoying because when I first got the mill, I found the gib would move with the table because the head of the bolt wasn’t a good fit for the slot in the gib. In the end I made very thin washers to take up the gap, but another screw on the back side of the gibs would be amazing.
Is it worth modifying the table for additional screws at the end when I have it off for scraping?
-
24th Jun 2020, 11:36 PM #47Golden Member
- Join Date
- Dec 2011
- Location
- Sydney
- Posts
- 505
Reading this thread I recall needing to repair a curved cast iron gib, but having no idea how to fix it.
Eventually I came across this: Cast Iron Gib making---trials and successes related to the CI warping when sawed - Page 2
It's a long post, but towards the he suggests peening the gib - carefully.
When I managed to overcome my reluctance to hit that flimsy little piece of cast iron with a hammer, it was done in a few minutes and almost entirely corrected the problem curve.
Bill
-
25th Jun 2020, 12:09 AM #48Golden Member
- Join Date
- Sep 2009
- Location
- Sydney
- Posts
- 666
-
25th Jun 2020, 12:23 AM #49Most Valued Member
- Join Date
- Jul 2010
- Location
- Melbourne
- Posts
- 9,088
The bend in your gib may come from those dings from the locks(cant tell from the pictures)
Maybe machining them out would help. You could even machine a slot on the so the bottom of the slot was square to the locks so its not so ugly next time. I wouldn't be trying to fill them.
But bare in mind, if you start scraping, in a perfect world you will likely need a new gib. In a less perfect world a packer behind it.
p.s. whats going on with the far end of the gib in the third picture in post 36?Last edited by Stustoys; 25th Jun 2020 at 12:26 AM. Reason: p.s.
-
25th Jun 2020, 01:52 AM #50
Hi Neevo, Guys,
If you have the room at the other end of the gib, I would be very tempted to drill and thread it the same as at the thick end and make a screw so that you can trap the gib and adjust it each way. You have to have a certain amount of play in there and being able to move the gib is a big advantage.
In the mean time I would give the gib a few strategic taps with a hammer !Best Regards:
Baron J.
-
25th Jun 2020, 02:29 AM #51Senior Member
- Join Date
- Aug 2007
- Location
- Saskatoon, Saskatchewan, Canada
- Posts
- 292
On the side that needs stretching. Each peening hit spreads the metal under it a little. When added together they make that side longer than the other.
Same process is used to shot peen straighten aluminium aircraft parts. Wing ribs cut from solid plate would curve a little beyond the flatness specs and were shot peened by the anodizing companies to flatten.
Pete
-
25th Jun 2020, 08:05 AM #52Golden Member
- Join Date
- Sep 2009
- Location
- Sydney
- Posts
- 666
-
25th Jun 2020, 01:23 PM #53Most Valued Member
- Join Date
- Jul 2010
- Location
- Melbourne
- Posts
- 9,088
-
25th Jun 2020, 04:11 PM #54Golden Member
- Join Date
- Sep 2009
- Location
- Sydney
- Posts
- 666
Yes, that’s the end that is at the right hand end when fitted. They’re gouges out of the gib that look like a grinding gouge of some sort. There’s no way to scrape them out without completely changing the dimensions of the gib I don’t think:
The other end has a angle on one side that means it’s not symmetrical but I can’t imagine this would have a huge impact as it’s relatively small vs the full width of the gib:
-
25th Jun 2020, 11:26 PM #55Golden Member
- Join Date
- Dec 2011
- Location
- Sydney
- Posts
- 505
Last edited by WCD; 25th Jun 2020 at 11:32 PM. Reason: extra wording
-
26th Jun 2020, 02:30 PM #56Most Valued Member
- Join Date
- Jul 2010
- Location
- Melbourne
- Posts
- 9,088
-
27th Jun 2020, 04:10 PM #57Golden Member
- Join Date
- Sep 2009
- Location
- Sydney
- Posts
- 666
Try and repair or learn to live with it?
Father in law gave me a small ball peen hammer. I checked the gib on my welding plate and it was pivoting in the middle. A few taps on the back side with the hammer (enough to leave very slight marks) and within about 8-10 hits across the back the bend has almost entirely disappeared
-
27th Jun 2020, 06:29 PM #58Golden Member
- Join Date
- Sep 2009
- Location
- Sydney
- Posts
- 666
Redoing the measurements with a slightly straightened gib. Interestingly now that I have a straight gib I think I have a problem with gib wear. The screw is bottoming out I’m sure. I can still get the required amount of play but no more.
Table right
Left: 0.16mm
Right: 0.16mm
Table Middle
Left: 0.12mm
Right: 0.05mm
Table Left
Left: 0.07mm
Right: 0.03mm
I wonder if I have a combination of gib wear and table wear? Left hand side of gib is worn more than right, and table is worn more in the middle causing the same numbers when far right?
-
27th Jun 2020, 06:35 PM #59Golden Member
- Join Date
- Sep 2009
- Location
- Sydney
- Posts
- 666
Try and repair or learn to live with it?
Duplicate post.
-
27th Jun 2020, 07:24 PM #60
Hi Neevo, Guys,
It could very well be a combination of both wear on the gib and table dovetail. You should be able to lock the table by screwing the gib in, if it doesn't tighten the table up you need to make a new gib strip or shim it.
Making a new tapered gib is not difficult. Carefully measure the old gib, before you put it back with a shim in the back and make a new gib on your own mill. You will need to pack the work piece carefully so that it is properly angled and supported for milling. A suitable length of brass or mild steel bar can be used since its unlikely that you will find any suitable cast iron.Best Regards:
Baron J.
Similar Threads
-
What did you learn today?
By Stustoys in forum METALWORK GENERALReplies: 940Last Post: 28th Mar 2024, 01:17 PM -
The things you can learn when you try
By Michael G in forum METALWORK GENERALReplies: 16Last Post: 28th Feb 2016, 09:52 PM -
which tafe course to learn?
By ftssjk in forum WELDINGReplies: 27Last Post: 2nd Jan 2012, 10:41 PM -
Where can i learn 6g tig welding??
By Jullin in forum WELDINGReplies: 12Last Post: 5th Apr 2008, 11:53 PM