This gage checks the wear-elongation of chains.
Test the chain elongation at a portion which is most
often engaged with the sprockets (portion more than likely to be worn).
Once the center on the pin of the chain to become measured
This gage checks the wear-elongation of chains.
Examine the chain elongation at a portion which is most
regularly engaged with the sprockets (portion almost certainly to get worn).
When the center of your pin of the chain to get measured reaches the arrow stage, it means that the chain continues to be critically elongated. In this case, change the chain.
Make use of the gage to verify the put on elongation of the chain.
General terms for sprockets
Nominal quantity of sprockets
The nominal quantity of a sprocket would be the same since the nominal quantity of the corresponding chain. By way of example, Chains such as 50, 50HK, and 50LD may be engaged by using a sprocket 50. It can be followed by symbols and characters indicating the amount of chain strands, the number of sprocket teeth, hub type, tooth head hardening, etc.
Diameter of prepared hole and shaft hole finishing
A regular sprocket for any single strand or double strand chain has a shaft hole prepared at a diameter stated inside the table of dimensions. 
When you finish the shaft hole, machine it in reference to your outer diameter or root diameter.
Hardening of tooth heads
The teeth of a sprocket must be tough and wear resistant as they are impacted when engaged with the rollers on the chain and worn by sliding with all the rollers. When severe wear and huge shocks are anticipated, sprocket.
Kinds, construction and supplies
made from carbon steel or cast steel ought to be utilized and high-frequency hardening should really be carried out.
The normal sprockets forty to 120 which has a hub on only one side for single and double strand chains are induction-hardened whether or not the amount of teeth is compact. Whether or not the solution is induction hardened or not is shown in the tables of dimensions of respective sprockets for your reference. Moreover, within the following situations, induction-harden the teeth in the sprocket.?The modest sprocket has twenty or significantly less teeth and it is utilized at 1/6 or much more with the highest velocity stated inside the table of greatest kilowatt ratings.
The modest sprocket is made use of at a modify gear ratio of four:one or more.
The compact sprocket is utilised to get a minimal pace massive load transmission as in instances of selection according to the “Low-speed selection”.
Sprockets are utilized in circumstances where the teeth are heavily worn.
Sprockets are employed below situations exactly where you will discover frequent commences and stops or sudden standard or reverse rotations.
Basic cautions
For choosing the quantity of teeth and pace ration in the sprocket, see “How to pick good chain” . For cautions for putting in a sprocket on the shaft and replacement timing, see “Installation adjustment maintenance” .
