TAZ Very loose Solid rod bearings?

A forum dedicated to the stock LulzBot TAZ 3D Printer
tmoore
Posts: 45
Joined: Tue Jan 28, 2014 1:03 am

Re: TAZ Very loose Solid rod bearings?

Post by tmoore » Thu Feb 13, 2014 10:01 pm

What's the Rockwell on the 10mm shafts that Lulzbot supplies on the TAZ?

Alup
Posts: 8
Joined: Wed Mar 05, 2014 11:29 pm

Re: TAZ Very loose Solid rod bearings?

Post by Alup » Wed Mar 05, 2014 11:33 pm

I have created a new bearing holder for the Taz that might solve this issue. I am still testing it but seems good so far. Check it out and let me know if i need to make any modifications to it.

It uses the Misumi part SHBZ10-25 for the bushing.

http://www.thingiverse.com/thing:263630

User avatar
Gemini64
Posts: 248
Joined: Tue Apr 16, 2013 6:37 pm
Location: Québec City, Canada

Re: TAZ Very loose Solid rod bearings?

Post by Gemini64 » Thu Mar 06, 2014 5:53 pm

Better late than never...
tmoore wrote:What's the Rockwell on the 10mm shafts that Lulzbot supplies on the TAZ?
There's no Rockwell, apparently they're Misumi SSFHR10-500 stainless steel rotary shafts - that is, according to the TAZ BOM available here: http://downloads.lulzbot.com/lulzbot/TAZ/hardware/

Misumi product page: http://us.misumi-ec.com/vona2/detail/110300086920/

tmoore
Posts: 45
Joined: Tue Jan 28, 2014 1:03 am

Re: TAZ Very loose Solid rod bearings?

Post by tmoore » Thu Mar 06, 2014 9:34 pm

Gemini64 wrote:Better late than never...
tmoore wrote:What's the Rockwell on the 10mm shafts that Lulzbot supplies on the TAZ?
There's no Rockwell, apparently they're Misumi SSFHR10-500 stainless steel rotary shafts - that is, according to the TAZ BOM available here: http://downloads.lulzbot.com/lulzbot/TAZ/hardware/

Misumi product page: http://us.misumi-ec.com/vona2/detail/110300086920/
Yeah there is. The 4137 alloy shafting is 30-35Rc, the 1045 shafting could be similar depending on how it was heat treated.
The 304 CRES is dead soft. Most likely fine with plastic bearings but with hard bearings you would be better off with shafting that is 55-58 Rc.

User avatar
Gemini64
Posts: 248
Joined: Tue Apr 16, 2013 6:37 pm
Location: Québec City, Canada

Re: TAZ Very loose Solid rod bearings?

Post by Gemini64 » Thu Mar 06, 2014 9:41 pm

tmoore wrote:Yeah there is.
As I said already, the Misumi part number shown in the BOM is SSFHR10-500.

If you look again at that Misumi page, SSFR stands for 304 Stainless Steel. The table lists "-" as surface treatment. Can we assume "-" means none?

You asked
tmoore wrote:What's the Rockwell on the 10mm shafts that Lulzbot supplies
To which I answered, if we are to believe the TAZ BOM, there is none.

User avatar
Orias
Aleph Objects | LulzBot
Posts: 1420
Joined: Wed Mar 27, 2013 1:24 pm
Location: US

Re: TAZ Very loose Solid rod bearings?

Post by Orias » Fri Mar 07, 2014 12:05 pm

I have not found any hardness (Rc or otherwise) information for the smooth rods.

Alup
Posts: 8
Joined: Wed Mar 05, 2014 11:29 pm

Re: TAZ Very loose Solid rod bearings?

Post by Alup » Fri Mar 07, 2014 1:29 pm

Well the ones that lulzbot uses (Misumi part number: SSFHR10-500) on there printers has like no documented HRC however. I just bought these rods and replaced the stock ones with these..

http://us.misumi-ec.com/vona2/detail/11 ... 3%3A%3A500

tmoore
Posts: 45
Joined: Tue Jan 28, 2014 1:03 am

Re: TAZ Very loose Solid rod bearings?

Post by tmoore » Fri Mar 07, 2014 10:18 pm

Gemini64 wrote:
tmoore wrote:Yeah there is.
As I said already, the Misumi part number shown in the BOM is SSFHR10-500.

If you look again at that Misumi page, SSFR stands for 304 Stainless Steel. The table lists "-" as surface treatment. Can we assume "-" means none?

You asked
tmoore wrote:What's the Rockwell on the 10mm shafts that Lulzbot supplies
To which I answered, if we are to believe the TAZ BOM, there is none.
The Rc may not be listed but there is a hardness for 304. Typically depending on the alloy it will be 25-37 HRC. With plastic bushings the stock rods would be fine. With ball bearings maybe not so good.

Alup
Posts: 8
Joined: Wed Mar 05, 2014 11:29 pm

Re: TAZ Very loose Solid rod bearings?

Post by Alup » Fri Mar 07, 2014 10:43 pm

Well I got the answer.
To: engineering
Subject: Re: FWD:Inquiry via website [About products]

can you tell me what the HRC is for product SSFHR10-500? It is not documented on the site that I can see/tell.

-----------------------------------------------------------------------------------------------------------------------------------------------

Hi Alup,

The material on this shaft will be standard non-hardened 304 stainless steel, its hardness is found in Metals Handbook. According to literature, its hardness is 88 HRB, which is substantially less than hardness ratings in the HRC scale.

Best regards,


Vince Chan
FA Standard Components Engineer
MISUMI USA, INC.

tmoore
Posts: 45
Joined: Tue Jan 28, 2014 1:03 am

Re: TAZ Very loose Solid rod bearings?

Post by tmoore » Sat Mar 08, 2014 10:26 am

88HRB converts to an Rc of 9.

Post Reply