HMG "New Jersey", SunRay rollers & Related

R

rashid11

Joined
Dec 8, 2005
Messages
707
I think I will name me Mark II Home Made Grinder (HMG, aka Her Majesty's Grinder) "New Jersey". The 1/2" steel plates, sheer power, weight, ability to reduce metal to dust - many a similarity !

On a serious note, the SunRay wheels/rollers came in: a 5x2 driver with a 7/8 bore + 3/16 keyway, a 4x2 (1/2 IB BB) tracking & 3" poly contact (1/2 ID BB). The first 2 are solid steel and weigh quite a bit. A++ quality, these folx
are legit, highly recommended. Do check often on the status of the order :D

http://www.sunray-inc.com/


So I wasted no time getting the HMG New Jersey closer to completion. Turned the tracking wheel to give it a crown, made a custom key for the driving wheel (L-shaped, to keep the wheel from sliding all the way down the shaft), D&T the motor's shaft for 3/8-16 - to keep the wheel from coming off, 5 LB steel wheel @ 4000 RPM can live a mark or two in one's garage.

I am thinking about reducing the weight of the tracking wheel ... hollow out the interior on me lathe, but that can wait.

While still a day or two from finishing the grinder, I fired it up and man, whatta beauty ! All the power in the word , variable RPM, reversible etc etc
etc. Tracks nicely, smooth as silk.

The tooling arm is quick-change design - just like @ http://www.caffreyknives.net/KMGarticle.html, so is the platen :)


I will get some pics out over the weekend.

Me Harbor Freight TIG and MIG were a tremendous help in construction. I welded the tooling arm's "channel".
 
Rashid,

I called SunRay guys. They said that wheels are not balanced. Balancing costs extra.
Can you tell us if these is any vibration when running these wheels?

Thanks,
Alex
 
Mine are 100%. No vibration. The 3" OD rubber contact wheel (black poly, but it sure feels like rubber) was certainly turned/trued up.

The other 2: 5" OD driver and 4" OD tracker were CNC-turned and as such,
there wuz no detectable runout. Metal's density being rather uniform, there's no need for "balancing" as such .



Balancing has to do more with when one has, say a "cast" caster wheel, that will naturally not be perfect. Even of there's no runout (exterior true
to the axis), distribution of mass due to bumps/dips & occasional internal voids acquired during casting, will not be uniform and you might want to balance it.
 
Another thought or 2:

- methinks that having heavier driving wheel helps, due to gyroscopic effect.
Of course, drawback is loosing some power spinning it up.

- the VFD (KBAC27D) "vibrations" when in "Constant Torque" mode have in fact disappeared as soon as I loaded the motor. I reported those 3 weeks ago and they certainly had me worried :)
 
You must log in or register to reply here.
Back
Top