Re: [Emc-users] Using CNC mill to hack a gantry Crane
If that is the bottom flange, just cut it off 2" above the flange, shorten the tube and but weld the tube back together again. If it is welded properly, then there will be no loss in strength. No machining is required. If you haven't done much welding before then it makes sense to find someone who can weld it properly. Dave On 10/17/2016 12:17 AM, hubert wrote: > Actually the flange in question is on the simplest end. The other end > of the tube has more features. I am inexperienced in welding and may > consider taking it to a professional. I have welded angle iron together > to make table frames, but in this case I feel it needs to be super > accurate as it forms the base to the vertical riser. At this stage I > have made all the band saw cuts. I do have carbide inserts for my face > mill which I will use to finish smoothing the flange that forms the > bottom of the riser. I will use a large endmill to square off end of > the tube. Since this area hasn't been welded, I will use HSS. > > Thanks for the various comments, they gave needed insight. > > Hubert > > > On 10/16/16 8:23 PM, Dave Cole wrote: >> Hubert, >> >> You might want to consider leaving the flange in place and to cut the >> tubing to shorten it/lengthen it. >> If you are making it shorter, chances are it will be stronger than needed. >> If your bandsaw makes a bad cut, mark the tubing, and grind it square. >> >> Dave >> >> On 10/15/2016 10:57 PM, hubert wrote: >>> I am wanting to cut down a 1000lb rated gantry crane to a size that will >>> fit my Shop. This crane is made from 2" rectangular tubing. I will do >>> the initial cutting with a Harbor Freight band saw, but I can't count on >>> it giving true 90 degree cuts. My thoughts are to true the cut surface >>> with my mill. I will also be cutting off the flange that will be welded >>> back on the tubing. My thoughts were to use the mill true the surface >>> of the flange. >>>My questions are related to the welds that I am trimming off. Will >>> they cause problems for the mill? Is it better to use High steel or >>> carbide? >>> >>> Thanks >>> Hubert >>> >>> -- >>> Check out the vibrant tech community on one of the world's most >>> engaging tech sites, SlashDot.org! http://sdm.link/slashdot >>> ___ >>> Emc-users mailing list >>> Emc-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/emc-users >> -- >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, SlashDot.org! http://sdm.link/slashdot >> ___ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> >> > > -- > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users -- Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Using CNC mill to hack a gantry Crane
Actually the flange in question is on the simplest end. The other end of the tube has more features. I am inexperienced in welding and may consider taking it to a professional. I have welded angle iron together to make table frames, but in this case I feel it needs to be super accurate as it forms the base to the vertical riser. At this stage I have made all the band saw cuts. I do have carbide inserts for my face mill which I will use to finish smoothing the flange that forms the bottom of the riser. I will use a large endmill to square off end of the tube. Since this area hasn't been welded, I will use HSS. Thanks for the various comments, they gave needed insight. Hubert On 10/16/16 8:23 PM, Dave Cole wrote: > Hubert, > > You might want to consider leaving the flange in place and to cut the > tubing to shorten it/lengthen it. > If you are making it shorter, chances are it will be stronger than needed. > If your bandsaw makes a bad cut, mark the tubing, and grind it square. > > Dave > > On 10/15/2016 10:57 PM, hubert wrote: >> I am wanting to cut down a 1000lb rated gantry crane to a size that will >> fit my Shop. This crane is made from 2" rectangular tubing. I will do >> the initial cutting with a Harbor Freight band saw, but I can't count on >> it giving true 90 degree cuts. My thoughts are to true the cut surface >> with my mill. I will also be cutting off the flange that will be welded >> back on the tubing. My thoughts were to use the mill true the surface >> of the flange. >> My questions are related to the welds that I am trimming off. Will >> they cause problems for the mill? Is it better to use High steel or >> carbide? >> >> Thanks >> Hubert >> >> -- >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, SlashDot.org! http://sdm.link/slashdot >> ___ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users > -- > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > -- Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Using CNC mill to hack a gantry Crane
Hubert, You might want to consider leaving the flange in place and to cut the tubing to shorten it/lengthen it. If you are making it shorter, chances are it will be stronger than needed. If your bandsaw makes a bad cut, mark the tubing, and grind it square. Dave On 10/15/2016 10:57 PM, hubert wrote: > I am wanting to cut down a 1000lb rated gantry crane to a size that will > fit my Shop. This crane is made from 2" rectangular tubing. I will do > the initial cutting with a Harbor Freight band saw, but I can't count on > it giving true 90 degree cuts. My thoughts are to true the cut surface > with my mill. I will also be cutting off the flange that will be welded > back on the tubing. My thoughts were to use the mill true the surface > of the flange. > My questions are related to the welds that I am trimming off. Will > they cause problems for the mill? Is it better to use High steel or > carbide? > > Thanks > Hubert > > -- > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users -- Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Using CNC mill to hack a gantry Crane
It your band saw one of those freestanding units with vice-like clamp and an automatic shutoff switch. I have one of those HF band saws that can cut 4" square stock. They cut straight enough for a part that will be welded later. a 1/16th inch error is is OK. Those saws are great, mine will do 4" solid stock. It slices round stock well enough that they can be faced in a lathe without to much work.It's a great tool. I set up the cut, turn it on and come back later and it's done. If it is a hand feed band saw with a flat table. Then make a jig to support the far end of the tube, cut it a little long then use an angle grinder to get right down to the scribbled line. Again, grinding to a scribed line by eyeball is good enough for parts that will be welded, The trick with a hand fed band saw is improvising a jib so the part only moves the way it should On Sun, Oct 16, 2016 at 11:46 AM, John Thornton wrote: > Actually after thinking about the problem and the tools available I > would cut a section out of the pipe above the base plate by scribing a > mark all the way around and only cutting one side at a time with the > band saw. Then jig it up with some flats to hold the two parts in line > and put a good tack on each corner... > > JT > > On 10/15/2016 9:57 PM, hubert wrote: > > I am wanting to cut down a 1000lb rated gantry crane to a size that will > > fit my Shop. This crane is made from 2" rectangular tubing. I will do > > the initial cutting with a Harbor Freight band saw, but I can't count on > > it giving true 90 degree cuts. My thoughts are to true the cut surface > > with my mill. I will also be cutting off the flange that will be welded > > back on the tubing. My thoughts were to use the mill true the surface > > of the flange. > > My questions are related to the welds that I am trimming off. Will > > they cause problems for the mill? Is it better to use High steel or > > carbide? > > > > Thanks > > Hubert > > > > > -- > > Check out the vibrant tech community on one of the world's most > > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > > ___ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > -- > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California -- Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Using CNC mill to hack a gantry Crane
Actually after thinking about the problem and the tools available I would cut a section out of the pipe above the base plate by scribing a mark all the way around and only cutting one side at a time with the band saw. Then jig it up with some flats to hold the two parts in line and put a good tack on each corner... JT On 10/15/2016 9:57 PM, hubert wrote: > I am wanting to cut down a 1000lb rated gantry crane to a size that will > fit my Shop. This crane is made from 2" rectangular tubing. I will do > the initial cutting with a Harbor Freight band saw, but I can't count on > it giving true 90 degree cuts. My thoughts are to true the cut surface > with my mill. I will also be cutting off the flange that will be welded > back on the tubing. My thoughts were to use the mill true the surface > of the flange. > My questions are related to the welds that I am trimming off. Will > they cause problems for the mill? Is it better to use High steel or > carbide? > > Thanks > Hubert > > -- > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users -- Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Using CNC mill to hack a gantry Crane
I would use carbide as the welds tend to be very hard. Before milling I would use a very coarse grit wheel on my angle grinder to grind as much weld off as possible. The welded place is most likely warped from the welding so watch for that when you try an mill. JT On 10/15/2016 9:57 PM, hubert wrote: > I am wanting to cut down a 1000lb rated gantry crane to a size that will > fit my Shop. This crane is made from 2" rectangular tubing. I will do > the initial cutting with a Harbor Freight band saw, but I can't count on > it giving true 90 degree cuts. My thoughts are to true the cut surface > with my mill. I will also be cutting off the flange that will be welded > back on the tubing. My thoughts were to use the mill true the surface > of the flange. > My questions are related to the welds that I am trimming off. Will > they cause problems for the mill? Is it better to use High steel or > carbide? > > Thanks > Hubert > > -- > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users -- Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Using CNC mill to hack a gantry Crane
Some weld metal is very hard. Try a hand file on a weld bead to see how easy it cuts. If you can't shave off a decent amount with moderate hand pressure you'll have a heck of a time milling the weld. How thick is the tubing wall? One solution could be to cut the end off, leaving a short stub, about 1/4" long. Mill the inside to a precise square, about halfway through the wall thickness. For the shortened beam, mill flats on each face then round the corners so you get a snug fit into the inside of the stub. Then weld a big fillet over the original weld, perhaps after grinding much of it away. From: hubert To: Emc-users@lists.sourceforge.net Sent: Saturday, October 15, 2016 8:57 PM Subject: [Emc-users] Using CNC mill to hack a gantry Crane I am wanting to cut down a 1000lb rated gantry crane to a size that will fit my Shop. This crane is made from 2" rectangular tubing. I will do the initial cutting with a Harbor Freight band saw, but I can't count on it giving true 90 degree cuts. My thoughts are to true the cut surface with my mill. I will also be cutting off the flange that will be welded back on the tubing. My thoughts were to use the mill true the surface of the flange. My questions are related to the welds that I am trimming off. Will they cause problems for the mill? Is it better to use High steel or carbide? -- Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
