Belt grinder advices

[Double J Creations]

Very nice tool!!
Thank you and thank to Frederic that passed me a useful link to a similar tool

Question for you, it's ok about shape and operation, but what kind of insert can be used? I'm surfing aliexpress page for indexing tools and parts but there are really many type, they have a specific name?
Saluti
Stefano

You could build your own indexing head, look up Gingery lathe. He published a series of how to books on building your own machine shop from scratch. The series of books start with teaching you how to build a foundry, all the tools needed and furnace to melt aluminum. Then teaches you how to build a mold to cast aluminum to build a metal cutting lathe, milling machine, drill press and accessories. One book teaches how to build a dividing head or indexing head. I have built it and it works wonderfully. I still have and use the lathe I built from 35 years ago. Here is the link.
Gingery Book Store

[rendoman]

I have to take a look, Good books are not easy to find!
Very rough work but functional, next thing to do engine brackets, maybe with a tensioner
I want also to add a plexi shield for eyes protection

[Double J Creations]

Looking good, I made a small benchtop version of this just to clean up shafts and edges of sheetmetal. Uses a 1" wide sanding belt, used a small double shaft A/C motor, just what I had laying around.

[rendoman]

Hi!
I'm going to finish the grinder, I changed a little the project, due to add more simplicity on engine pulley. I can't do a good job with broaching, so I decided to make some holes with grains to link the pulley with engine.
I have to build a sort of frame for motor, and maybe add some reinforcement.

A couple of pictures as usual

[rendoman]

Accurate enough, even if it's not a perfect job.
I changed the position of motor, I don't know if convert the frame to fixed, since I will not use the upper shaft with pulley for speed.

[rendoman]

Engine wheel should be in right position, Tomorrow I will try to turn on and see what happens.

[rendoman]

Hi!
I changed the upper wheel because the one I built last year wasn't good. I increased the diameter. I should tune the front wheels-shafts and maybe try the first run.
I'm thinking about the polishing attachment

[aphilipmarcou]

Belt grinders are great machines in any shop. Seems to me that you are not going to get a high enough feet per minute speed on the belt because of the small diameter of the motor wheel even if the motor is 2 pole (3000 rpm). Are you getting at least 4000 feet per minute?

[rendoman]

Hi!
With the combination of wheels (4" motor - 3" Others) and 2800 rpm, I should have 2932.2 ft / min according to calculator, it's about 15 m\s. According to 3M manual it's good for titanium, I should need 5 more m\s for perfect work. A 6" wheel can fix the problem, reaching about 22m\s - 4300 ft \ min, But i'm not happy to make a large wheel now, because I need large round aluminum bar, maybe in the future if the grinder will be not enough.


https://www.blocklayer.com/pulley-belteng.aspx

http://multimedia.3m.com/mws/media/3...g-industry.pdf

[rendoman]

It seems working!
I'm thinking about to put a spring in the vertical tensioner, but I don't know how much force is needed.
Wheels are planar, with no crown or angle, the regulation of belt path is so sensible.
Some advice in order to make a better machine?